MDCAT Chemistry The Halogens and Noble Gases Online Test

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Chemistry

1. The atomic radius increases as we move down a group because

Atomic number increases

Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

2. Alkali metals displace hydrogen from water forming bases due to the reason that

They are far above the hydrogen in electrochemical series based on oxidation potential

They are far below the hydrogen in electrochemical series based on oxidation potential

Their ionization potential is less than that of other elements

They contain only one electron in their outermost shell

3. Several blocks of magnesium are fixed to the bottom of a ship to

To prevent the action of water and salt

Mark the ship lighter

Prevent puncturing by under sea rock

Keep away the sharks

4. Electron affinity depends on

Atomic size and nuclear charge both

Atomic size

Nuclear charge

Atomic number

5. Action of caustic soda on aluminum hydroxide gives a compound having formula

Na₂Al(OH)₄

NaAlO₂

Na₃AlO₃

Al₂(OH)₄

6. Among the fluorides listed below the one which does not exist?

HeF₄

SF₄

CF₄

XeF₄

7. Limestone is not used in which of the following manufacturing processes?

Ordinary (soda lime) glass

Phosphorus from phosphorite

Iron from haematite

Solvay process of sodium carbonate

8. Which of the following is a man made element?

Ra

Lr

Rn

Fr

9. Hydrochloric acid at 25°C is

None of these

Ionic and liquid

Covalent and liquid

Ionic and gas

10. Which halogen has application in medicines mostly?

Br2

I₂

None

Cl₂

11. What is the order of power of halogen as an oxidizing agent?

U₂>Br₂>I₂>F₂

F₂>Cl₂>Br₂>I2

I₂>Br₂>U₂>F₂

I₂>F₂>Br₂>U₂

12. Which of the following has the least ionization potential?

N

Zn

Li

He

13. Fluorine differs from other halogens due to

Low first ionization energy

Small size

High dissociation energy

All

14. Which one halogen can show only-1 oxidation state?

Br

I

F

Cl

15. The element which has a simple cubic lattice in solid state is

Te

Se

None of these

Po

16. The element that does not form a monoxide is

Lead

Tin

Silicon

Germanium

17. Which of the following oxides is peroxide?

BaO

SO₂

Na₂O₂

Mn₂O

18. The metal that dissolves in liquid ammonia, giving a dark blue coloured solution is

Sodium

Silver

Lead

Zinc

19. Gradual addition of electronic shells in the noble gases causes a decrease in their

Atomic radius

Ionization energy

Density

Boiling point

20. When sulphur is boiled with Na₂SO₃ solution, the compound formed is

Sodiums sulphates

Sodium thiosulphate

Sodium sulphides

Sodium persulphate

21. On heating sodium metal in a current of dry ammonia, the compound formed is

Sodium nitride

Sodium hydride

Sodium amide

Sodium azide

22. The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.

Argon

CO₂

Greater amount of nitrogen molecules derived from N¹⁵ isotope

Some nitrogen molecules analogous to O₂

23. Which one boric acid is stable one?

H₃BO₃

None of these

HBO₃

H₂B₄O₇

24. The most stable +2 oxidation state is exhibited by

Pb

Si

S

Fe

25. Plaster of Paris is used

As a plaster for walls

In metallurgical process

In dentistry and surgery

As a drying agent

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26. Which one of the following reacts with hemoglobin to form carboxuhaemoglobin?

CO₂

H₂O₂

O₂

CO

27. Carbonates of li are less stable than that of Na due to

Lower electro positivity

Low electronegativity

Low charge density

None

28. Which of the following element has the maximum electron affinity?

I

S

F

Cl

29. B, Al, Ga, In and Tl belong IV group of the period table show a decrease with increasing relative atomic mass:

The stability of +2 oxidation state

The first ionization energy

Ionic character of the compound

The basic character of the oxides

30. In the electrolytic extraction of aluminum fused cryolite is added

To protect the anodes

To act as reducing agent

To increase Al production

To make a conducting solution of bauxite

31. The process associated with sodium carbonate manufacture is known as

Castner

Chamber

Solvay

Haber

32. Chlorine acts as a bleaching agent only in the presence of

Dry air

Sun light

None of these

Moisture

33. When NaOH is made, the gas released at the cathode is

H₂

O₂

Cl₂

H₂O

34. Which is the strongest acid?

HClO₄

HClO₂

HClO

HClO₃

35. A 500 g toothpaste sample has 0.2 g fluoride concentration. What is the concentration of F¯ ions in terms of ppm level?

400

250

200

1000

36. Which of the following compounds is explosive in nature?

Phosphorus trichloride

Nitrosyl chloride

Hyponitrous acid

Nitrogen trichloride

37. Which of the following is most electronegative?

C

Sn

Si

Pb

38. Inert pair effect plays an important role in case of

F

Si

Al

Tl

39. Which one is the weakest oxyacid of chlorine?

HCIO₂

HCIO₄

HCIO₃

HCIO

40. One which is not dissolved by dilute hydrochloric acid is

ZnS

BaSO₄

MnS

BaCO₃

41. The substance not likely to contain CaCO₃ is

Dolomite

A marble states

Sea shells

Calcried gypsum

42. The noble gases consist of

Single free atoms

Triatomic molecules

Diatomic molecules

Atoms linked by weak bonds

43. Point out the correct equation which represents the strong action of heat on calcium nitrate.

C

D

B

A

44. Halogens exist in the form of

Cannot be predicted

Various forms

Diatomic molecules

Monoatomic molecules

45. All the elements of oxygen family are

Radioactive

Non-metals

Polymorphic

Metalloids

46. Which is not correct reason about the oxidizing power of halogens depending on various factors?

Electron affinity

Energy dissociation

High atomic number

Hydration energy

47. The last orbit of argon would have electrons

2

18

8

6

48. Pyrex glass is a mixture of

Sodium silicate and lead silicate

Sodium borosilicate and aluminum borosilicate

Sodium silicate and calcium silicate

Sodium silicate and aluminum borosilicate

49. Epsom salt is the hydrate of one of the following

Magnesium ammonium phosphate

Calcium sulphates

Ferrous ammonium sulphate

Magnesium sulphates

50. Which one of the following properties is not correct for ozone?

It cannot act as a bleaching agent

It oxidizes lead sulphides

It oxidizes mercury

It oxidizes potassium iodide

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51. The strongest reducing agent out of Na, K, Rb And Cs is

Na

Rb

Cs

K

52. The metal extracted by electrolysis of its fused salt is

Iron

Lead

Copper

Sodium

53. The elements with atomic numbers 9, 17, 35, 53, 85 and all

Heavy metals

Noble gases

Light metals

Halogens

54. Which gives green colour in fireworks?

Sodium

Calcium

Potassium

Barium

55. Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

11%

44%

33%

22%

56. Sea divers go deep in the sea water with a mixture of which of the following gases?

CO₂ and Ar

O₂ and Ar

O₂ and CO₂

O₂ and He

57. In the modern long form of the periodic table, elements are arranged in the increasing order of

Atomic mass

Mass number

Atomic number

Isotopic number

58. Orthophosphoric acid is

Monobasic

Tetrabasic

Tribasic

Dibasic

59. Calico printing means

Cloth printing

Paper printing

Leather printing

Glass printing

60. The noble gas forming the maximum number of compounds

Ar

Ne

Xe

He

61. Among HCL, HBr and Hl, Hi shows highest B.P due to

Dipole-dipole forces

H. bonding

None of these

Strongest vanderwaal’s force

62. Mark the correct statement

Li₂CO₃ is soluble in water

Carbonates of Ca, Ba, Sr are soluble in water

Carbonates of Na, K, NH₄ are soluble in water

Basic carbonates of Mg and Cu are soluble in water

63. Among noble gases xenon gives compounds due to

Zero electron affinity

Large size

Structure

Higher I-P

64. In certain respects, lithium differs from other alkali metals. The main reason for this is

Extremely high electropositivity of Li

Hydration of Li⁺ ion

Greater hardness of Li

Small size of lithium atom and Li⁺ ion

65. Which one of the following elements belongs to halogen family?

Astatine

Francium

Radium

Polonium

66. The compounds of alkaline earth metals have the following magnetic nature

Paramagnetic

Diamagnetic

Antiferromagnetic

Ferromagnetic

67. The oxyacids of phosphorus in which phosphorus has the lowest oxidization state is

Orthophosphoric acid

Hypo phosphorous acid

Metaphosphoric acid

Pyro phosphoric acid

68. Bromine is obtained on a commercial scale from

Common salt

Caliche

Carnallite

Cryolite

69. XeF₄ on partial hydrolysis produces

XeF₂

XeOF₂

XeOF₄

XeO₃

70. Phosphide ion has the electronic structure similar to that of

Chloride ion

Sodium ion

Fluoride ion

Nitride ion

71. An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of

Weak acid and strong base

Strong acid and strong base

Strong acid and weak base

Weak acid and weak base

72. Which of the following metal is present in chlorophyll?

Cobalt

Magnesium

Chromium

Iron

73. Number of elements present in 5th period is

24

32

18

8

74. Which of the following is an inert gas?

O₂

H₂

Argon

N₂

75. An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is

14

11

10

16

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76. Boron compounds behave as Lewis acid because of their

Acidic nature

Covalent nature

Ionization property

Electron deficiency

77. Which noble gas is used in infilament bulbs to stop the filament burning out too quickly?

Argon

Neon

Helium

Krypton

78. For two ionic solids CaO and Kl, identify the wrong statement among the following?

CaO has high m.p.

Lattice energy of CaO is much higher than that of Kl

Kl is soluble in benzene

Kl has high m.p.

79. Which among the following species has the highest ionization energy?

F

Li

B

Ne

80. The increase of Van der Waal’s forces in halogens is in the order of

Br₂ > Cl₂ > F₂ > I₂

I₂ > Br₂ > Cl₂ > F₂

F₂ > Cl₂ > Br₂ > I₂

Cl₂ > Br₂ > I₂ > F₂

81. Crystalline form of sulphur stale at room temperature is

Rhombic sulphur

Monoclinic sulphur

Prismatic sulphur

Plastic sulphur

82. Which of the following is acidic?

N₂O

HgO

SO₃

BeO

83. HNO₂ acts as an/a

All the three

Oxidizing agent

Reducing agent

Acid

84. Beryllium is placed above magnesium in the second group. Beryllium dust, therefore, when added to MgCl₂ solution will

Have no effect

Precipitate Mg

Leads to the dissolution of beryllium metal

Precipitate Mg metal

85. Which of the following does not exhibit the periodicity in properties of the elements?

Electro negativity

N/P ratio

Ionization energy

Atomic radius

86. The important ore of lead is

Haematite

Bauxite

Chalcopyrites

Galena

87. Lithium is strongest reducing agent among alkali metals due to which of the following factor?

Ionization energy

Hydration energy

Electron affinity

Lattice energy

88. Bleaching powder loses its power on keeping for a long time because

It change into calcium hypochlorate

It changes into calcium chloride and calcium chlorate

It changes into CaCl₂ and Ca(OH)₂

It absorbs moisture

89. The halogen which has only one oxidation state is

I

F

Br

Cl

90. Which one of the elements reacts directly with nitrogen to form nitride?

Li

Rb

K

Ba

91. In the periodic table, the element with atomic number 16 will be placed in the group

Fourth

Sixth

Fifth

Third

92. Bleaching powder reacts with a few drops of conc. HCl to give

Hypochlorous acid

Oxygen

Chlorine

Calcium oxide

93. Calcium is obtained by

Roasting lime stone

Electrolysis of molten anhydrous or fused calcium chloride

Reduction of calcium chloride with carbon

Electrolysis of solution of calcium chloride in water

94. Gradual addition of electronic shells in the noble gases causes a decrease in their

Density

Ionization energy

Boiling point

Atomic radius

95. Solution of sodium metal in liquid ammonia in strongly reducing due to the presence in the solution of the following

Solvated electrons

Sodium atoms

Sodium hydride

Sodium amide

96. Compared with the alkaline earth metals, the alkali metals exhibit

Greater hardness

Smaller ionic radii

Highest boiling points

Lower ionization energies

97. Among the halogens the rare element is

Iodine

Astatine

Fluorine

Chlorine

98. Which noble gas is used earth quake prediction?

He

Rn

Ar

Kr

99. Vander Waals forces are stronger in

Br₂

I₂

Cl₂

F₂

100. Which of the noble gas has highest polarizabilities?

Kr

Xe

He

Ar

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101. The structure of XeF₆

Tetrahedral

Pyramidal

None of these

Distorted octahedral

102. Elements of which of the following groups will from anions most readily?

Nitrogen family

Oxygen family

Alkali metals

Halogens

103. The alkali metals

Show decreased chemical reactivity with dry oxygen in going form Li to Cs

Show increasing electro negativity from Li to Cs.

Form salts which are predominantly covalent

Form salt like hydrides

104. Which one of them is monoatomic?

Neon

Nitrogen

Fluorine

Oxygen

105. A metal is burnt in air and the ash on moistening smells of ammonia. The metal is

Fe

Na

Mg

Al

106. Who reported first noble gas?

Frank land

Ramsay

Cavendish

J.J Thomson

107. The name of CaSO₄. ½ H₂O is

Dolomite

Epsom salt

Gypsum

Plaster of Paris

108. The correct sequence of elements in the decreasing order of first ionization energy is

Mg > Na > Al > Si

Na > Mg > Al > Si

Si > Mg > Al > Na

Al > Mg > Na > Si

109. Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because

Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

Nitrogen is highly soluble in water

Under the sea nitrogen and oxygen react to give poisonous nitric oxide

110. Identify the correct statement

Gypsum is obtained by heating plaster of pairs

Plaster of Pairs can be obtained by partial oxidation of gypsum

Gypsum contains a lower percentage of calcium than plaster of pairs

Plaster of Paris is obtained by partial oxidation of gypsum

111. Because of its small size and due to restriction of its valence shell to an octet fluorine differs from other halogens, which behavior of fluorine is incorrect?

It has highest first I.E

It restricts to oxidation state – 1 only

It has highest E.N

It is more reactive than other halogens

112. Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C?

Nitric oxide

Nitrogen dioxide

Nitrous oxide

Dinitrogen tetraoxide

113. Which of the following halogens dose not form oxy acid?

Chlorine

Bromine

Iodine

Fluorine

114. Which of the following will liberate hydrogen by its reaction with hydrochloric acid?

Phosphorus

Magnesium

Mercury

Copper

115. The following has zero valency

Be

Al

Kr

Na

116. Alkali metals are generally extracted by

Double decomposition methods

Reduction methods

Electrolytic methods

Displacement methods

117. Which of the following belongs to the halogen family?

Francium

Radium

Astatine

Polonium

118. 6NaOH + Cl₂ → 5Nacl + Naclo₃ in this reaction chlorine is

No change

Oxidized

Reduced

Both oxidized and reduced

119. Which of the following statements is not correct for a noble gas?

Ar is used in electric bulbs

Half-life of Rn is only 3-8 days

Ne is obtained during radioactive disintegration

HE is used in producing very low temperatures

120. Identify the incorrect statement with respect to ozone.

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone protects the earth’s inhabitants by absorbing gamma-radiations

Ozone is more reactive than dioxygen

121. The number of electrons that are paired in oxygen molecule are

16

12

14

7

122. Electrolysis of fused anhydrous KCl.MgCl₂.6H₂O gives

Potassium only

Magnesium only

Magnesium and chlorine

Potassium and magnesium

123. A Major constituent of Portland cement (except lime) is

Iron oxide

Silica

Magnesia

Alumina

124. Bromine can be liberated from KBr solution by the action of

Iodine solution

NaCl

Chlorine

Ki

125. Which of the following is most electronegative?

Tin

Lead

Carbon

Silicon

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126. Which shows maximum catenation property?

O

Se

Te

S

127. Match List I with List II and select the answer using the codes given below:

Code	List I	Code	List II
a	XeF₄	1	Distorted octahedral
b	XeF₆	2	Tetrahedral
c	XeO₃	3	Square planar
d	XeO₄	4	Trigonal pyramidal

a-3, b-1, c-4, d-2

a-2, b-3, c-1, d-4

a-4, b-1, c-3, d-2

a-1, b-4, c-2, d-3

128. Which of the following statements is incorrect?

Melting and boiling points of alkali metals decrease down the group

Sodium is the not most abundant metal in earth’s crust

Sodium is the most abundant metallic element in sea water

Ionic character of alkali metal halides decreases down the group

129. Mark the incorrect statement about ‘Li’

‘Li’ is not effected by air

‘Li’ combine with nitrogen directly to form Lithium nitride

When burn in oxygen, ‘Li’ forms super oxide LiO₂

‘Li’ has a great tendency to form hydrates

130. What is the atomic number (Z) of the noble gas that reacts with fluorine?

18

10

54

2

131. The halogen having highest electron affinity is

Fluorine

Iodine

Chlorine

Bromine

132. Sea weeds are important source of

Iodine

Iron

Chlorine

Bromine

133. The noble gases are

Diatomic

Monoatomic

All of these

Polyatomic

134. Which element forms an ion with charge +3?

Be

Si

Al

C

135. Keeping in view the uses of Al, mark the incorrect statement. Al is used

In form of foil for wrapping

As an abrasive in the form of abundum

For preparing artificial

As an oxidizer in metallurgy

136. Aluminum is most abundant in earth’s crust, yet it is obtained from bauxite because

Bauxite contains maximum of Al

Bauxite is available in large quantity

Of easy extraction of Al from it

Bauxite is less impure

137. Which is true for an element R present in group 13 of the periodic table?

It is a gas at room temperature

It forms R₂O₃

It has oxidation state of +4

It forms RX₂

138. The oxidizing power of halogens depends upon various factors. Which are not the correct reasons?

Energy dissociation

Electron affinity

Hydration energy of ion

High atomic number

139. Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

Phosphorus pentoxidse

Anhydrous calcium chloride

Active charcoal

Na₃PO₄

140. Fluorine differs from other halogens due to its small size and restriction of its valence shell to an octet. Mark the correct behavior of fluorine

It is more reactive than other halogens

It has highest first ionization energy

It restricts to oxidation state – 1 only

It has highest electronegativity

141. The number of elements in the 4th period of periodic table is

18

8

10

32

142. Which noble gas is used in labors?

Neon

Krypton

Helium

Argon

143. When a colourless gas is passed through bromine water only decolourisation takes place the gas is

HCl

H₂S

HBR

SO₂

144. An atom with high electro negativity has

Large size

Low electron affinity

Low ionization potential

High ionization potential

145. The acid which has a peroxy linkage is

Dithionic acid

Carlo’s acid

Sulphurous acid

Pyrosulphuric acid

146. Which halogen acid is a liquid no room temperature?

HU

HI

HF

HBr

147. The ionization potential is lowest for the

Inert gases

Alkaline earth metals

Halogens

Alkali metals

148. Select the gas which is used in electrical discharge lights

Nitrogen

Oxygen

Neon

Helium

149. Which one is hygroscopic in nature?

HBr

HNO3

HCL

HUO4

150. Hydrogen fluorine is a lipid unlike other hydrogen halides because

Fluorine is highly reactive

HF is the weakest acid

HF molecules form intermolecular H-bonds

Fluorine atom is smaller in size

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151. In the fractional distillation of liquid air, the gas that boils off last is

H₂

O₂

Ar

He

152. Which of the following is true for magnesium?

It is a strong reducing agent

It is manufactured by electrolysis of aqueous magnesium chloride

It is more electropositive than sodium

It resembles, in chemical properties, with its diagonally placed element Boron in III group of the Periodic Table

153. Neon glows in discharge tube as

Yellowish

Greenish

Bluish

Radish

154. Mark the element which shows greatness inert pair effect

Iodine

Bromine

Chlorine

Fluorine

155. If one liter of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

10mL

Zero

800 mL

200mL

156. Mark the element which shows only one oxidation state is its compounds

Br

F

I

Cl

157. The noble gas He was discovered by

Frank land and Lockyer

Chadwick

Dorn

Rutherford

158. Cl₂O₇ is best prepared by passing by

Chlorine and oxygen over hot silver chlorate

Perchloric acid (CHIO₄) over hot silver oxide

Chlorine gas over hot HgO

Hydrogen chloride over phosphorus pentoxide

159. The most abundant inert gas in the atmosphere is

He

Kr

Ne

Ar

160. Choose the correct statement about heat of vapourization of noble gases

It increases gradually down the group

None of these

It decreases gradually down the group

Noble gases have o heat of vapourization

161. The percentage of lead in lead pencil is

20

70

80

Zero

162. Which one of the halogen acid is a liquid?

Hl

HBr

HCl

HF

163. The shape of gaseous SnCl₂ is

Angular

t-shaped

Linear

Tetrahedral

164. Which of the following substance is used for drying gases?

Calcium oxide

Sodium carbonate

Calcium carbonate

Sodium bicarbonate

165. The one which does not show variable valency is

Copper

Titanium

Barium

Lead

166. I₂ is solid at room temperature because

It is highly electronegative

It has metallic bond

It possess hydrogen bonding

Its molecule has a large size

167. The oxide of which of the following elements will be acidic in character

Mg

Cl

Li

Rb

168. Which of the following phosphorus is most reactive?

White phosphorus

Scarlet phosphorus

Red phosphorus

Violet phosphorus

169. The bleaching action of chlorine is due to

Oxidation

Hydrogenation

Chlorination

Reduction

170. Fluorine is a stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except.

Heat of dissociation

Electron affinity

Ionization potential

Heat of hydration

171. In the Hoop’s process for refining of Al the fused materials form three different layers and they remain separated during electrolysis also. This is because

Three layers have different densities

Three layers are maintained at different temperatures

The upper layer is kept attracted by cathode and lower layer is kept attracted by anode

There is special arrangement is cell to keep the layers separate

172. The metal with highest electrical resistance at room temperature is

Te

Fe

Pb

Po

173. In the manufacture of bromine form sea water, the mother liquor containing bromides is treated with

Sulphur dioxide

Carbon dioxide

Chlorine

Iodide

174. Which of the following halogen does not exhibit positive oxidation state in its compounds?

F

Br

I

Cl

175. The colour of I₂ in CCI₄ is

Violet

Colourless

Bluish green

Radish brown

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176. The atomic numbers of four elements are given below. Which one is an alkaline earth metal?

40

30

20

10

177. According to the Periodic Law of elements, the variation in properties of elements is related to their

Atomic numbers

Atomic masses

Nuclear neutron-proton number rations

Nuclear masses

178. Which of the following hydrogen halide is the weakest acid in solution?

HI

HF

HBr

HCl

179. The difference of water molecules in gypsum and plaster of Paris is

½

5/2

2

1½

180. Which of the following is correct?

Magnallium is one alloy of Mg and zinc

Magnesium reacts with cold water and liberates hydrogen

Sodium reduces CO₂ to carbon

In the Castner process of sodium extraction, NaCl is used as an electrolyte

181. Which one of the following reactions is not associated with the Solvay process of manufacture of sodium carbonate?

CO₃ + H₂O → H₂CO₃

NH₃ + H₂CO₃ → NH₄HCO₃

NaCl + NH₄HCO₃ → NaHCO₃ + NH₄Cl

2NaOH + CO₂ → Na₂CO₃ + H₂O

182. Which of the following halogens does not form its oxy acids?

Iodine

Chlorine

Bromine

Fluorine

183. Oxygen shows oxidation states

-2, +2, +6

+2, -2

-2

+2, +4, +6

184. Mark the correct statement

Br is more reactive than Cl₂

Iodine is a solid

None of these

Cl₂ is more insoluble in water

185. Mark the incorrect statement about the conductance semi-conductors in photoelectric cells and solar batteries. Semi conductors show

Different resistance under different circumstance

Increase in resistance with increase in temperature

Decrease in resistance with increase in temperature

Decease in resistance with intensity of light

186. Mark the smallest atom

F

I

Cl

Br

187. Molten sodium chloride conducts electricity due to the presence of

Free molecules

Free electrons

Atoms of sodium and chlorine

Free ions

188. Which is the symbol of element whose atoms have the outermost configuration 2S²2P³ is

N

C

P

Li

189. Nitrolim is

Ca(CN)₂ + C

All

CaCN₂ + C

CaC₂ + C

190. Which one of the following has highest electropositive character?

Ba

Cr

Cu

Cs

191. SO3 is not dissolve directly in H2O because

The reaction is quite slow

The reaction does not go to completion

SO₃ is insoluble in H₂O

The reaction is highly exothermic

192. The halogens exist as halides. Which is not common place whose they are found?

In sea

In the atmosphere

In lakes

As salts in ponds

193. Which element react directly with Kr, Xe and Rn?

O

Br

F

U

194. Select the weakest acid among the following

HF

HBr

HI

HCl

195. In view of their low ionization energies, the alkali metals are

Weak reducing agents

Strong reducing agents

Strong oxidizing agents

Weak oxidizing agents

196. Alkaline earth metals show standard electrode potential values which are very similar to their alkali metals due to

None of these of M²⁺ ions

High energies of hydration of M²⁺ in solution

Diamagnetic nature

High lattice energy of M²⁺ ions in the solid state

197. The solubilities of carbonates decrease down the magnesium group due to a decrease in

Hydration energies of cations

Inter ionic attraction

Entropy of solution formation

Lattice energies if solids

198. In curing cement plasters, water is sprinkled from time to time. This helps is

Converting sand into silici acid

Hydrating sand and gravel mixed with cement

Developing interlocking needle like crystals of hydrated silicates

Keeping it cool

199. Presence of which of the following salt increases the rate of setting of plaster of Paris.

CuSO₄

BaSO₄

NaCl

KCl

200. Which one has highest electron affinity?

Cl

F

I

Br

Page 9 of 14

201. Sulphuric acid reacts with PCl₅ to give

Sulphur tetrachloride

Sulphur monochloride

Thionyl chloride

Sulphuryl chloride

202. Which of the following is most volatile?

HBr

HCl

HF

HI

203. Which statement is true about IV A group

There is a regular gradation of properties from top to bottom

Abrupt change of properties

Marked change of properties

Whole group consist of non-metals

204. Heavy water is obtained by

Prolonged electrolysis of water

Simple distillation of water

Dissolving heavy salt in water

Removing impurities of calcium and magnesium form water

205. Which one has least dissociation energy?

HCL

HF

HBr

HI

206. Which of the halogen has highest electronegativity?

Chlorine

Bromine

Fluorine

Iodine

207. In which of the following groups, when he is placed, its all properties are satisfied?

With inert gases

With halogens

None of these

With alkali metals

208. Point out the property which is not characteristic of alkali metals

Their ions are isoelectronic with noble gases

Low melting point

Low electronegativity

High ionization energy

209. Fluorides of Ca, Mg, Ba and Sr are

Variable trend

Insoluble in water

Less soluble in water

Highly soluble in water

210. Air is not a commercial source of which noble gas

Ne

Xe

He

Ar

211. Which of the following alkaline earth metals is the strongest reducing agent?

Ba

Ca

Sr

Mg

212. Polyanion formation is maximum in

Sulphur

Boron

Oxygen

Nitrogen

213. Which is the strongest acid

HCLO4

Cannot be predicted

HNO3

HCL

214. XeF₄ involves which hybridization

Sp

Sp²d

Sp³d²

Sp²

215. On heating quick lime with coke in an electric furnace, we get

Ca and CO₂

CaCO₃

CaO

CaC₂

216. Electropositive character increase down the group due to

Decrease in electronegativity of the elements

All of these

Increase in atomic size of elements

Decrease in I.P

217. When K₂O is added to water, the solution is basic because it contains a significant concentration of

O₂¯²

O³¯

OH¯

K⁺

218. What is more true about alkali metals?

Oxidizing agents

Hydrolyzing agents

Reducing agents

Both oxidizing and reducing agents

219. What causes nitrogen to be chemically inert?

Multiple bond formation in the molecule

Absence of bond polarity

High bond energy

Short internuclear distance

220. The most powerful oxidizing agent among the halogens is

Br₂

F₂

Cl₂

I₂

221. Keeping in view the uses of sodium silicate, select the incorrect statement:

It is as filter for soap

It is used in the formation white cement

It is used as fire proof in textile

It is used furniture polish

222. How does the ionization energy of 1st group elements vary?

Increases down the group

Remains unchanged

Decreases down the group

Variation is not regular

223. Which of the following on heating at 125°C gives plaster of Paris?

Alum

Calomel

Borax

Gypsum

224. Freon-12 is used as a

Insecticide

Fungicide

Refrigerant

Herbicide

225. The melting point in lowest for

Be

Sr

Mg

Ca

Page 10 of 14

226. The halogen that is most easily reduced is

F₂

Cl₂

I₂

Br₂

227. Eka-aluminum and Eka-silicon are known as

Iron and sulphur

Gallium and Germanium

Aluminum and silicon

Proton and silicon

228. Which is valence shell configuration of halogens?

NS₂, nP₄

nS₂, nP₃

ns₂, nP₅

nS₂, nP₆

229. To a clear solution of compound (X) a solution of BaCl₂ is added and a heavy white precipitate is formed which does not dissolve in dilute HCl. The compound X is

A carbonate

A sulphate

A bromide

A nitrate

230. Cassiterite is an ore of

Ni

Mn

Sn

Sb

231. Identify the correct statement

Elemental Na is easily oxidized

Elemental Na is insoluble in NH₃

Element sodium can be prepared and isolated by electrolyzed an aqueous solution of NaCl.

Elemental Na is a strong oxidizing agent

232. The lowest boiling point of helium is due to its

Inertness

High polarisability

Gaseous nature

Weak van der Waals forces between atoms

233. Which element has strongest attraction for its valence electrons?

F

I

Br

Cl

234. Which molecule has a coordinate covalent bond in its structure?

NH₃

CO

Al₂O₃

CO₂

235. Which of the following compounds of cement sets at the slowest rate?

Tri-calcium aluminate

Diclacium silicate

Tri-calcium silicate

Tetra calcium aluminoferrite

236. Which one of these is most reactive?

Na

Pb

Mg

K

237. In Solvay ammonia process, sodium bicarbonate is precipitated due to

Presence of NH₃

Reaction with brine solution

Reaction with CO₂

Reaction with NaOH

238. Sodium chloride when heated with conc. H₂SO₄ and solid potassium dichromate gives

Chromous chloride

Chromyl chloride

None

Chromic chloride

239. The electronic configuration of metal M is 1s², 2s², 2p⁶, 3s¹. The formula of its oxide would be

M₂O₃

M₂O

MO₂

MO

240. Deliquescence is a process in which a solid

Loses water of crystallization

Absorbs moisture and remain solid

Increases the water of crystallization

Absorbs moisture and turn into liquid

241. As a fixing agent in photography, sodium thiosulphate is used for

Converting silver halides to metallic silver

Dissolving out unreacted silver bromide

Preventing overdeveloping and fogging

Reducing solubility of AgBr

242. Mark the nitrate which decomposes differently on heating

KNO₃

LiNO₃

NaNO₃

RbNO₃

243. Which of the following has highest dipole moment?

SbH₃

AsH₃

PH₃

NH₃

244. When ammonia is heated with cupric oxide, a molecule of ammonia will

Gain 2 electrons

Lose 3 electrons

Gain 3 electrons

Lose 2 electrons

245. Fluorine is a better oxidizing agent than Br₂. It is due to

More electro negativity of fluorine

Small size of fluorine

Non-metallic nature of fluorine

More electron repulsion in fluorine

246. The correct formula of Plaster of Paris is

CaSO₄.2H₂O

CaSO₄. 3H₂O

CaSO₄. 1/2H₂O

CaSO₄

247. The correct order of electron affinity among the following is

Br > Cl > F

F > Cl > Br

Cl > F > Br

F > Br > Cl

248. Which of the following is the lifesaving mixture for an asthma patient?

Mixture of xenon and nitrogen

Mixture of argon and oxygen

Mixture of neon and oxygen

Mixture of helium and oxygen

249. Which member of the halogen family (X₂) does not show positive oxidation sate (X⁺₂)?

Chlorine

Fluorine

Iodine

Bromine

250. Which is the most volatile compound?

HF

HI

HBr

HCl

Page 11 of 14

251. The correct order of electron affinity of B, C, N, O is

O > C > N > B

B > N > C > O

O > B > C > N

O > C > B > N

252. NaoH is named as caustic soda because

It is used in soda water

It reacts with chlorine gas

It reacts with fats to form soap

It corrodes the organic tissues

253. White enamel of our teeth is

CaBr₂

Ca₃(PO₄)₂

CaCl₂

CaF₂

254. Among the alkaline earth metals the element forming predominantly covalent compound is

Strontium

Beryllium

Calcium

Barium

255. Electron affinity of sulphur is

Less than O but more than SE

More than O but less than Se

More than O and Se

Equal to O and Se

256. The variety of glass used in making lenses and prisms of

Flint glass

Soda glass

Crooke’s glass

Borosilicate glass

257. Aluminum (III) chloride forms a dimer because

Al belongs to third group

Higher co-ordination can be achieved by Al

Al has high ionization energy

It cannot form a trimer

258. The element with highest electron affinity among the halogen is

Br

Cl

I

F

259. Which statement is correct about halogens?

They are all diatomic and form univalent ions

They are all capable of exhibiting several oxidation states

They are all diatomic and form divalent ions

They can mutually displace each other from the solution of their compounds with metals

260. Which of the following statement about fluorine is not correct?

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine does not form oxoacid

261. Sulphuric acid has great affinity for water because

It hydrolyses the acid

Acid forms hydrates with water

It decomposes the acid

Acid decomposes water

262. All halogen are

Oxidizing agents

Oxidizing as well as reducing agents

Drying agents

Reducing agents

263. LiF is insoluble in water, while NaF and KF are soluble. This is due to

High covalent nature

Small ionic size of Li⁺

High ∆H lattice

Low ∆H lattice

264. Which one of the following is a correct set for SiO₂?

Tetrahedral, acidic

Linear, basic

Angular, disc

Linear acidic

265. The metal used for making radiation shield is

Fe

Zn

Al

Pb

266. AlCl₃ flumes in moist air because

It is highly hygroscopic

It is covalent

It is very volatile

HCl is formed in moist air

267. O²¯ has high ionic radius because the ionic radius of anion is greater than individual element. Which of the following oxides is amophteric in character?

SiO₂

CO₂

SnO₂

CaO

268. The halogen which reacts spontaneously with Au(s) to produce Au³⁺ is:

F₂

I₂

Br₂

Cl₂

269. The type of hybridization of born in diborane is

Sp²-hybridisation

Sp-hybridisation

Sp³d²-hybridisation

Sp³- hybridization

270. Which halogen is most electropositive?

Br

Cl

I

F

271. The spectrum of helium is expected to be similar to that of

He⁺

Li⁺

Na

H

272. Mg is an important component of which biomolecule occurring extensively in living world?

Florigen

ATP

Chlorophyll

Haemoglobin

273. When one mole of bleaching powder is completely decomposed, then the mass of chlorine gas that is liberated will be

17.72 g

35.45 g

88.60 g

70.90 g

274. Among noble gases (from He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon

Has the largest size

Has the highest heat of vaporization

In the most readily available gas

Has the lowest ionization enthalpy

275. The properties of lithium are similar to those of Mg this is because

The ratio of their charge to size is nearly the same

Both are found together in nature

Both have nearly the same size

Both have similar electronic configurations

Page 12 of 14

276. Which of the following statements is incorrect about halogens?

All the halogens react with noble gases to form their halides

They have high electron affinity and ionization energy

All are non-metals

All the halogens have electronic configuration ns2P5

277. The last member of the family of inert gases is

Argon

Neon

Xenon

Radon

278. Hypo is used in photography for

The fixation of picture

The colour of picture

Picture printed

Developing picture

279. The metal used in the thermite process because of its activity is

Iron

Aluminum

Zinc

Copper

280. Which is the gas among the following that reacts with H₂ is darkness?

I₂

Cl₂

Br₂

F₂

281. Indicate the correct statement

Alkali metal atom has the smallest size in its period

Alkali metals do not reacts with metals

Alkali metals have ns’ configuring in outermost shells

Na cl on electrolyzing give sodium the anode and cl at cathode

282. Choose the non metallic element whose molecules contain maximum number of its atoms

Si

O

As

P

283. Which gas can support combustion?

CO₂

N₂O

CO

N₂

284. NaOH is prepared by the method

Down’s cell

Castner Kellner cell

Castner cell

Solvay process

285. Choose a set which has both member from the same periods of periodic table

Ca, Cl

Cl, Br

Na, Cl

Na, Ca

286. The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because

There is no change in the nuclear charge

None of these

There is increase in the nuclear charge of the alkaline earth metals

There is decrease in the nuclear charge of the alkaline earth metals

287. Which of the following has the highest melting point?

NaCl

NaBr

Nal

NaF

288. Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon?

Coal

Diamond

Graphite

Coke

289. Which of the following fluorides of xenon is impossible?

XeF₄

XeF₆

XeF₂

XeF₃

290. Which is true about the electro negativity order of the following?

Br > Cl

Sr > Ca

C > N

P > Si

291. Which one is the biggest ion?

Na⁺

Ba²⁺

Mg²⁺

Al³⁺

292. Which of the following noble gases does not have an octet of electrons in its outermost shell?

Neon

Argon

Helium

Radon

293. Mark the compound which does not exist

SbCl₅

NCl₅

AsF₅

PF₅

294. Permonosulphuric acid is known as

Sulphuric acid

Carlo’s acid

None of these

Marshall’s acid

295. Reactivity of borazole is greter than that of benzene because

Of localized electrons in it

Borazole is electron deficient compound

Borazole is nonpolar compound

Borazole is polar compound

296. Which of the following is an electron management of a noble gas?

2,8,18,2

2,8

2,8,7

2,8,2

297. Which statement is correct?

Noble gases have low m.p and b.p.

Noble gases will all burn in pure oxygen

None of these

Noble gases are all dense gases

298. Aqueous NaCl solution is electrolyzed using platinum electrodes. What is the product formed at cathode?

H₂

O₂

Cl₂

Na

299. Alkaline earth metals comes under

Inner transition elements

Representative elements

Halogens

Transition elements

300. Which of the following species has the highest ionization potential?

Mg⁺

Li⁺

Ne

Al⁺

Page 13 of 14

301. Variable valency is characteristic of

Noble gas

Halogen

Alkali metals

Transition elements

302. Strongest reducing agent is

Hl

HCl

HF

HBr

303. Which of the following has greatest reducing power?

HCl

HI

HBr

304. Which of the following ion has the highest value of ionic radius?

F¯

B³⁺

Li⁺

O²¯

305. Which of the halogen can displace other three elements?

Bromine

Iodine

Chlorine

Fluorine

306. Which of the following sets of atomic numbers belong to that of the alkali metals?

37, 19, 3, 55

1, 12, 30, 4, 62

9, 17, 35, 53

12, 20, 56, 88

307. The atoms with high values of first ionization potential values always have

Strongly bond valence electrons

Metallic properties

Large atomic size

Small ionic size

308. Which halogen have most corrosive action on skin?

Br₂

Chlorine

F₂

I₂

309. The solubility of carbonates decrease down the Mg group due to decrease in

Entropy of solution formation

Lattice energy solids

Hydration energies of cations

Inter – ionic attraction

310. Two elements whose electro negativities are 1.2 and 3.0, the bond formed between them would be

Metallic

Ionic

Covalent

Coordinate

311. A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

Sodium hydride

Solvated electrons

Sodium atoms

Sodium amide

312. Which one halogen is radioactive?

Bromine

Iodine

Astatine

Chlorine

313. Which one of the following properties of alkali metals increases in magnitude as the atomic number rises?

Ionic radius

Electro negativity

Melting point

First ionization energy

314. Which of the following has highest first ionization potential?

Carbon

Oxygen

Nitrogen

Boron

315. Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

III group radicals are precipitated as hydroxides

IV group radicals are precipitated as sulphides

Sulphur is present in the mixture as impurity

Of the oxidation of H₂S gas by some acid radicals

316. Bond angle is minimum for

H₂O

H₂Se

H₂S

H₂Te

317. P₂O₅ is heated with water to give

Orthophosphoric acid

Phosphorous acid

Hypo phosphoric acid

Hypo phosphorous acid

318. Which of the following species has maximum number of unpaired electrons?

O₂+

O₂-

O₂

None of these

319. Which reason best accounts for the use of helium in modern airships?

Lighter than air and cheap to produce

Expense, but a very uncreative gas

Expensive but easy to store in cylinder

Less dense then air and not flammable

320. Which of the following noble gas is not present in atmosphere?

Ne

Ar

Rn

He

321. All the following decompose easily on heating to give oxygen except

Manganese dioxide

Lead nitrate

Potassium chlorate

Mercuric oxide

322. Which of the following is not isoelectronic?

O²¯

Mg²⁺

Na⁺

Cl¯

323. Which of the following isoelectronic ions has the lowest ionization energy?

S²¯

Ca²⁺

Cl¯

K⁺

324. In which form boron exist mostly in nature

Oxides

Oxyborates

Sulphides

Nitrides

325. Common oxidation state of boron are

+1

+3

-3

+3,-3

Page 14 of 14

326. Which one among the following form maximum number of compounds?

Rn

Kr

Ar

Xe

327. Sodium sulphates is solute in water but barium sulphates is insoluble because

The lattice energy of BaSO₄ is more than its hydration energy

The lattice energy has no role to play in solubility

Both a and b

The hydration energy of Na₂SO₄ is more than its lattice energy

328. A clathrate may be defined as a

Liquid crystal

Solid solution

Cage compound

Mixture

329. The most acidic of the following compounds is

P₂O₃

Sb₂O₃

As₂O₃

B₂O₃

330. Fluorine does not show positive oxidation states due to the absence of

p-orbitals

s-orbitals

d-orbitals

None

Total Questions:	330
Time Allowed:	80 Minutes
Total Marks:	330
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Chemistry The Halogens and Noble Gases MCQS Online Test

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