Chemistry The Halogens And Noble Gases Online Mcqs Test

Page 1 of 14

Chemistry

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

Sr > Ca

Br > Cl

P > Si

C > N

2. Which is the strongest acid

Cannot be predicted

HNO3

HCL

HCLO4

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

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

Fluorine cannot be prepared by electrolysis of fused metal fluorides

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

Al > Mg > Na > Si

Na > Mg > Al > Si

Si > Mg > Al > Na

Mg > Na > Al > Si

5. The acid which has a peroxy linkage is

Carlo’s acid

Dithionic acid

Pyrosulphuric acid

Sulphurous acid

6. Which of the following is acidic?

N₂O

BeO

SO₃

HgO

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

Different resistance under different circumstance

Decrease in resistance with increase in temperature

Increase in resistance with increase in temperature

Decease in resistance with intensity of light

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

Developing interlocking needle like crystals of hydrated silicates

Converting sand into silici acid

Keeping it cool

Hydrating sand and gravel mixed with cement

9. Which statement is correct about halogens?

They are all diatomic and form univalent ions

They are all diatomic and form divalent ions

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

They are all capable of exhibiting several oxidation states

10. Sulphuric acid has great affinity for water because

It decomposes the acid

It hydrolyses the acid

Acid decomposes water

Acid forms hydrates with water

11. Which one is hygroscopic in nature?

HBr

HUO4

HCL

HNO3

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

P

Li

N

C

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

Radium

Polonium

Astatine

Francium

14. 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

15. Pyrex glass is a mixture of

Sodium silicate and calcium silicate

Sodium borosilicate and aluminum borosilicate

Sodium silicate and lead silicate

Sodium silicate and aluminum borosilicate

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

CaC₂

CaCO₃

CaO

Ca and CO₂

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

Iron

Zinc

Copper

Aluminum

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

Hypo phosphorous acid

Pyro phosphoric acid

Metaphosphoric acid

Orthophosphoric acid

19. Mark the incorrect statement about ‘Li’

‘Li’ has a great tendency to form hydrates

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

‘Li’ combine with nitrogen directly to form Lithium nitride

‘Li’ is not effected by air

20. The noble gases consist of

Triatomic molecules

Atoms linked by weak bonds

Single free atoms

Diatomic molecules

21. The substance not likely to contain CaCO₃ is

A marble states

Dolomite

Sea shells

Calcried gypsum

22. AlCl₃ flumes in moist air because

It is very volatile

It is highly hygroscopic

It is covalent

HCl is formed in moist air

23. Boron compounds behave as Lewis acid because of their

Ionization property

Acidic nature

Covalent nature

Electron deficiency

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

Has the lowest ionization enthalpy

In the most readily available gas

Has the largest size

Has the highest heat of vaporization

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

Entropy of solution formation

Lattice energies if solids

Hydration energies of cations

Inter ionic attraction

Page 2 of 14

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

Sodium amide

Sodium atoms

Sodium hydride

Solvated electrons

27. The noble gas He was discovered by

Rutherford

Dorn

Chadwick

Frank land and Lockyer

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

Al⁺

Mg⁺

Li⁺

Ne

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

1, 12, 30, 4, 62

9, 17, 35, 53

12, 20, 56, 88

37, 19, 3, 55

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

Atomic number increases

Effective nuclear charge increases

Additive electrons are accommodated in new electron level

Atomic mass increases

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

40

10

20

30

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

HBR

HCl

H₂S

SO₂

33. Mark the nitrate which decomposes differently on heating

RbNO₃

KNO₃

LiNO₃

NaNO₃

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

F

Al

Tl

Si

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

Helium

Radon

Argon

Neon

36. 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

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

Dry air

None of these

Sun light

Moisture

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

Ionic

Covalent

Coordinate

Metallic

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

Greater hardness of Li

Extremely high electropositivity of Li

Small size of lithium atom and Li⁺ ion

Hydration of Li⁺ ion

40. Variable valency is characteristic of

Halogen

Alkali metals

Transition elements

Noble gas

41. The ionization potential is lowest for the

Alkaline earth metals

Inert gases

Alkali metals

Halogens

42. The structure of XeF₆

Pyramidal

Distorted octahedral

Tetrahedral

None of these

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

Na

H₂

O₂

Cl₂

44. White enamel of our teeth is

CaCl₂

Ca₃(PO₄)₂

CaF₂

CaBr₂

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

Nitrogen dioxide

Nitrous oxide

Dinitrogen tetraoxide

Nitric oxide

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

HCl

Hl

HBr

HF

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

NaCl

BaSO₄

CuSO₄

KCl

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

Reaction with NaOH

Presence of NH₃

Reaction with CO₂

Reaction with brine solution

49. Select the weakest acid among the following

HCl

HF

HBr

HI

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

Insoluble in water

Highly soluble in water

Less soluble in water

Variable trend

Page 3 of 14

51. XeF₄ involves which hybridization

Sp

Sp²d

Sp³d²

Sp²

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

O > C > N > B

O > C > B > N

B > N > C > O

O > B > C > N

53. Which noble gas is used earth quake prediction?

Kr

He

Rn

Ar

54. Which is valence shell configuration of halogens?

nS₂, nP₆

NS₂, nP₄

ns₂, nP₅

nS₂, nP₃

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

Ba

K

Rb

Li

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

NaCl + NH₄HCO₃ → NaHCO₃ + NH₄Cl

2NaOH + CO₂ → Na₂CO₃ + H₂O

CO₃ + H₂O → H₂CO₃

NH₃ + H₂CO₃ → NH₄HCO₃

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

H

Li⁺

Na

He⁺

58. Sea weeds are important source of

Iron

Iodine

Bromine

Chlorine

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

HI

HF

HCl

HBr

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

Atomic numbers

Nuclear masses

Atomic masses

Nuclear neutron-proton number rations

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

F₂ > Cl₂ > Br₂ > I₂

Cl₂ > Br₂ > I₂ > F₂

Br₂ > Cl₂ > F₂ > I₂

I₂ > Br₂ > Cl₂ > F₂

62. All the elements of oxygen family are

Polymorphic

Non-metals

Radioactive

Metalloids

63. Which of the following is most electronegative?

Carbon

Lead

Silicon

Tin

64. The element that does not form a monoxide is

Germanium

Lead

Tin

Silicon

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

Br₂

F₂

Cl₂

I₂

66. Which one has highest electron affinity?

Cl

Br

F

I

67. Which gas can support combustion?

CO₂

CO

N₂

N₂O

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

Cr

Cs

Cu

Ba

69. Mark the element which shows greatness inert pair effect

Chlorine

Bromine

Fluorine

Iodine

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

Fluorine

Bromine

Chlorine

Iodine

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

Calcium sulphates

Magnesium sulphates

Magnesium ammonium phosphate

Ferrous ammonium sulphate

72. Nitrolim is

All

CaCN₂ + C

CaC₂ + C

Ca(CN)₂ + C

73. The percentage of lead in lead pencil is

Zero

70

20

80

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

None of these

Noble gases have o heat of vapourization

It decreases gradually down the group

It increases gradually down the group

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

Hydration energy

Energy dissociation

High atomic number

Electron affinity

Page 4 of 14

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

Free electrons

Free ions

Free molecules

Atoms of sodium and chlorine

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

Mg

Rb

Li

Cl

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

Sr

Ca

Mg

Ba

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

Smaller ionic radii

Greater hardness

Lower ionization energies

Highest boiling points

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

Ca, Cl

Cl, Br

Na, Cl

Na, Ca

81. The halogen that is most easily reduced is

Cl₂

F₂

Br₂

I₂

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

For preparing artificial

As an oxidizer in metallurgy

As an abrasive in the form of abundum

In form of foil for wrapping

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

Lattice energy of CaO is much higher than that of Kl

CaO has high m.p.

Kl is soluble in benzene

Kl has high m.p.

84. Bromine is obtained on a commercial scale from

Carnallite

Common salt

Caliche

Cryolite

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

O²¯

F¯

B³⁺

Li⁺

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

CO₂

O₂

CO

H₂O₂

87. The name of CaSO₄. ½ H₂O is

Gypsum

Epsom salt

Plaster of Paris

Dolomite

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

Chlorine

Fluorine

Bromine

Iodine

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

F

I

Br

Cl

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

High lattice energy of M²⁺ ions in the solid state

High energies of hydration of M²⁺ in solution

Diamagnetic nature

None of these of M²⁺ ions

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

Sodium sulphides

Sodium persulphate

Sodium thiosulphate

Sodiums sulphates

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

Remains unchanged

Variation is not regular

Increases down the group

Decreases down the group

93. 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 E.N

It is more reactive than other halogens

It has highest first I.E

It restricts to oxidation state – 1 only

94. The noble gases are

All of these

Diatomic

Monoatomic

Polyatomic

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

Al

C

Be

Si

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

Sodium ion

Fluoride ion

Chloride ion

Nitride ion

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

Mercuric oxide

Potassium chlorate

Manganese dioxide

Lead nitrate

98. The correct formula of Plaster of Paris is

CaSO₄

CaSO₄. 3H₂O

CaSO₄. 1/2H₂O

CaSO₄.2H₂O

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

Ionization potential

Heat of hydration

Heat of dissociation

Electron affinity

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

HI

HU

HBr

HF

Page 5 of 14

101. Mark the correct statement

None of these

Br is more reactive than Cl₂

Iodine is a solid

Cl₂ is more insoluble in water

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

Nitrogen family

Halogens

Oxygen family

Alkali metals

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

Crooke’s glass

Borosilicate glass

Flint glass

Soda glass

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

Low charge density

Lower electro positivity

None

Low electronegativity

105. Electron affinity depends on

Atomic size

Nuclear charge

Atomic size and nuclear charge both

Atomic number

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

The hydration energy of Na₂SO₄ is more than its lattice energy

The lattice energy has no role to play in solubility

The lattice energy of BaSO₄ is more than its hydration energy

Both a and b

107. Which of the following is not isoelectronic?

Na⁺

Mg²⁺

Cl¯

O²¯

108. The following has zero valency

Al

Be

Na

Kr

109. What is more true about alkali metals?

Both oxidizing and reducing agents

Reducing agents

Hydrolyzing agents

Oxidizing agents

110. The most acidic of the following compounds is

P₂O₃

B₂O₃

As₂O₃

Sb₂O₃

111. Freon-12 is used as a

Herbicide

Insecticide

Refrigerant

Fungicide

112. Calcium is obtained by

Roasting lime stone

Electrolysis of solution of calcium chloride in water

Reduction of calcium chloride with carbon

Electrolysis of molten anhydrous or fused calcium chloride

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

Al

Mg

Na

Fe

114. 6NaOH + Cl₂ → 5Nacl + Naclo₃ in this reaction chlorine is

No change

Both oxidized and reduced

Oxidized

Reduced

115. The colour of I₂ in CCI₄ is

Bluish green

Colourless

Radish brown

Violet

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

Iron

Chromium

Cobalt

Magnesium

117. Which is the most volatile compound?

HBr

HCl

HI

HF

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

Fluorine

Bromine

Iodine

Chlorine

119. Which one is the weakest oxyacid of chlorine?

HCIO

HCIO₃

HCIO₂

HCIO₄

120. Deliquescence is a process in which a solid

Absorbs moisture and turn into liquid

Increases the water of crystallization

Absorbs moisture and remain solid

Loses water of crystallization

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

F > Cl > Br

Br > Cl > F

Cl > F > Br

F > Br > Cl

122. XeF₄ on partial hydrolysis produces

XeOF₄

XeOF₂

XeF₂

XeO₃

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

Metallic properties

Strongly bond valence electrons

Large atomic size

Small ionic size

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

O₂ and Ar

CO₂ and Ar

O₂ and CO₂

O₂ and He

125. Which one boric acid is stable one?

H₂B₄O₇

None of these

H₃BO₃

HBO₃

Page 6 of 14

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

Chromic chloride

None

Chromyl chloride

Chromous chloride

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

All are non-metals

All the halogens react with noble gases to form their halides

All the halogens have electronic configuration ns2P5

They have high electron affinity and ionization energy

128. In which form boron exist mostly in nature

Oxides

Oxyborates

Sulphides

Nitrides

129. Halogens exist in the form of

Diatomic molecules

Cannot be predicted

Various forms

Monoatomic molecules

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

H₂

O₂

He

Ar

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

10

16

14

11

132. 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

133. Which statement is correct?

Noble gases will all burn in pure oxygen

None of these

Noble gases are all dense gases

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

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

Cl

F

I

Br

135. The one which does not show variable valency is

Barium

Lead

Titanium

Copper

136. Which of the following has highest dipole moment?

SbH₃

AsH₃

NH₃

PH₃

137. NaoH is named as caustic soda because

It reacts with fats to form soap

It is used in soda water

It reacts with chlorine gas

It corrodes the organic tissues

138. Mark the compound which does not exist

AsF₅

SbCl₅

NCl₅

PF₅

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

Si

Pb

S

Fe

140. 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 forms RX₂

It has oxidation state of +4

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

Atomic mass

Mass number

Isotopic number

Atomic number

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

Ionization energy

Density

Atomic radius

Boiling point

143. Aluminum (III) chloride forms a dimer because

Higher co-ordination can be achieved by Al

Al has high ionization energy

It cannot form a trimer

Al belongs to third group

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

CO

NH₃

Al₂O₃

CO₂

145. P₂O₅ is heated with water to give

Orthophosphoric acid

Phosphorous acid

Hypo phosphoric acid

Hypo phosphorous acid

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

I₂>Br₂>U₂>F₂

U₂>Br₂>I₂>F₂

I₂>F₂>Br₂>U₂

F₂>Cl₂>Br₂>I2

147. Hypo is used in photography for

The colour of picture

Picture printed

The fixation of picture

Developing picture

148. Cl₂O₇ is best prepared by passing by

Chlorine gas over hot HgO

Hydrogen chloride over phosphorus pentoxide

Perchloric acid (CHIO₄) over hot silver oxide

Chlorine and oxygen over hot silver chlorate

149. The metal used for making radiation shield is

Fe

Al

Pb

Zn

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

Energy dissociation

Hydration energy of ion

Electron affinity

High atomic number

Page 7 of 14

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

Ionization energy

Electro negativity

N/P ratio

Atomic radius

152. 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

153. The last orbit of argon would have electrons

8

2

6

18

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

2

5/2

½

1½

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

XeF₃

XeF₆

XeF₂

XeF₄

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

C

A

B

D

157. 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 restricts to oxidation state – 1 only

It has highest first ionization energy

It is more reactive than other halogens

It has highest electronegativity

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

Precipitate Mg

Leads to the dissolution of beryllium metal

Have no effect

Precipitate Mg metal

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

Diamagnetic

Antiferromagnetic

Paramagnetic

Ferromagnetic

160. Which of the noble gas has highest polarizabilities?

Xe

Kr

He

Ar

161. 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

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

O₂¯²

O³¯

K⁺

OH¯

163. Which one has least dissociation energy?

HI

HCL

HBr

HF

164. Polyanion formation is maximum in

Boron

Oxygen

Sulphur

Nitrogen

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

It absorbs moisture

It changes into calcium chloride and calcium chlorate

It changes into CaCl₂ and Ca(OH)₂

It change into calcium hypochlorate

166. Hydrochloric acid at 25°C is

Ionic and liquid

None of these

Covalent and liquid

Ionic and gas

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

Hyponitrous acid

Nitrogen trichloride

Phosphorus trichloride

Nitrosyl chloride

168. Common oxidation state of boron are

-3

+1

+3,-3

+3

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

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

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

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

Density

Ionization energy

Boiling point

Atomic radius

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

Br

F

U

O

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

MnS

BaCO₃

ZnS

BaSO₄

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

Melting point

Ionic radius

First ionization energy

Electro negativity

174. Orthophosphoric acid is

Tribasic

Monobasic

Dibasic

Tetrabasic

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

H. bonding

Strongest vanderwaal’s force

Dipole-dipole forces

None of these

Page 8 of 14

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

Of the oxidation of H₂S gas by some acid radicals

Sulphur is present in the mixture as impurity

III group radicals are precipitated as hydroxides

IV group radicals are precipitated as sulphides

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

Nal

NaCl

NaBr

NaF

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

F

I

S

Cl

179. Bond angle is minimum for

H₂Se

H₂S

H₂Te

H₂O

180. 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

181. Which gives green colour in fireworks?

Calcium

Sodium

Barium

Potassium

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

Rb

Na

K

Cs

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

Cl

I

F

Br

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

CF₄

XeF₄

HeF₄

SF₄

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

32

8

18

10

186. What causes nitrogen to be chemically inert?

Multiple bond formation in the molecule

High bond energy

Short internuclear distance

Absence of bond polarity

187. Alkaline earth metals comes under

Transition elements

Representative elements

Halogens

Inner transition elements

188. Among the halogens the rare element is

Astatine

Fluorine

Chlorine

Iodine

189. Number of elements present in 5th period is

8

32

18

24

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

2,8

2,8,7

2,8,18,2

2,8,2

191. Indicate the correct statement

Alkali metals do not reacts with metals

Alkali metals have ns’ configuring in outermost shells

Alkali metal atom has the smallest size in its period

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

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

Astatine

Polonium

Radium

Francium

193. The type of hybridization of born in diborane is

Sp-hybridisation

Sp²-hybridisation

Sp³d²-hybridisation

Sp³- hybridization

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

HE is used in producing very low temperatures

Ar is used in electric bulbs

Ne is obtained during radioactive disintegration

Half-life of Rn is only 3-8 days

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

Weak van der Waals forces between atoms

Inertness

High polarisability

Gaseous nature

196. Cassiterite is an ore of

Sb

Ni

Sn

Mn

197. The halogen which has only one oxidation state is

F

Br

Cl

I

198. Which of the following is most volatile?

HI

HCl

HF

HBr

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

M₂O₃

M₂O

MO

MO₂

200. Which of the following oxides is peroxide?

Mn₂O

BaO

SO₂

Na₂O₂

Page 9 of 14

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

F

Br

I

Cl

202. Which of the following is most electronegative?

C

Si

Pb

Sn

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

None of these

Se

Po

Te

204. 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 are maintained at different temperatures

Three layers have different densities

There is special arrangement is cell to keep the layers separate

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

205. Crystalline form of sulphur stale at room temperature is

Rhombic sulphur

Plastic sulphur

Monoclinic sulphur

Prismatic sulphur

206. Mark the correct statement

Carbonates of Na, K, NH₄ are soluble in water

Li₂CO₃ is soluble in water

Carbonates of Ca, Ba, Sr are soluble in water

Basic carbonates of Mg and Cu are soluble in water

207. The shape of gaseous SnCl₂ is

Angular

Tetrahedral

t-shaped

Linear

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

Cl₂

H₂O

O₂

H₂

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

Rn

Fr

Ra

Lr

210. 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-1, b-4, c-2, d-3

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

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

Ar

Rn

Xe

Kr

212. HNO₂ acts as an/a

Acid

Oxidizing agent

Reducing agent

All the three

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

7

12

16

14

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

Their ions are isoelectronic with noble gases

High ionization energy

Low melting point

Low electronegativity

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

1000

200

400

250

216. 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

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

Aluminum and silicon

Proton and silicon

Iron and sulphur

Gallium and Germanium

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

Lose 2 electrons

Gain 2 electrons

Lose 3 electrons

Gain 3 electrons

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

O₂

None of these

O₂+

O₂-

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

He

Zn

Li

N

221. Calico printing means

Cloth printing

Glass printing

Leather printing

Paper printing

222. Which one halogen is radioactive?

Iodine

Astatine

Bromine

Chlorine

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

Florigen

ATP

Chlorophyll

Haemoglobin

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

Phosphorus pentoxidse

Na₃PO₄

Anhydrous calcium chloride

Active charcoal

225. Alkali metals are generally extracted by

Double decomposition methods

Electrolytic methods

Displacement methods

Reduction methods

Page 10 of 14

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

Hypochlorous acid

Chlorine

Oxygen

Calcium oxide

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

I

Br

Cl

F

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

10

54

2

18

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

The first ionization energy

Ionic character of the compound

The basic character of the oxides

The stability of +2 oxidation state

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

Copper

Lead

Sodium

Iron

231. Plaster of Paris is used

In dentistry and surgery

In metallurgical process

As a plaster for walls

As a drying agent

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

Bromine

Fluorine

Chlorine

Iodine

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

Small ionic size of Li⁺

High covalent nature

High ∆H lattice

Low ∆H lattice

234. The important ore of lead is

Bauxite

Galena

Chalcopyrites

Haematite

235. Vander Waals forces are stronger in

Br₂

I₂

F₂

Cl₂

236. I₂ is solid at room temperature because

It has metallic bond

Its molecule has a large size

It is highly electronegative

It possess hydrogen bonding

237. Which of the following is an inert gas?

N₂

O₂

H₂

Argon

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

It oxidizes potassium iodide

It oxidizes mercury

It cannot act as a bleaching agent

It oxidizes lead sulphides

239. Which of the following is correct?

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

Sodium reduces CO₂ to carbon

Magnallium is one alloy of Mg and zinc

Magnesium reacts with cold water and liberates hydrogen

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

Pb

Po

Fe

Te

241. Which halogen have most corrosive action on skin?

Br₂

Chlorine

F₂

I₂

242. Which halogen has application in medicines mostly?

Cl₂

Br2

I₂

None

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

To act as reducing agent

To increase Al production

To protect the anodes

To make a conducting solution of bauxite

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

Sodium amide

Sodium hydride

Solvated electrons

Sodium atoms

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

Rn

Ne

He

Ar

246. The halogen having highest electron affinity is

Iodine

Bromine

Fluorine

Chlorine

247. A clathrate may be defined as a

Liquid crystal

Cage compound

Mixture

Solid solution

248. Which one of them is monoatomic?

Fluorine

Neon

Nitrogen

Oxygen

249. The noble gas forming the maximum number of compounds

Xe

Ar

He

Ne

250. Who reported first noble gas?

Ramsay

J.J Thomson

Cavendish

Frank land

Page 11 of 14

251. Sulphuric acid reacts with PCl₅ to give

Thionyl chloride

Sulphuryl chloride

Sulphur monochloride

Sulphur tetrachloride

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

P

Si

As

O

253. The melting point in lowest for

Mg

Sr

Ca

Be

254. Which of the halogen has highest electronegativity?

Chlorine

Iodine

Bromine

Fluorine

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

Silver

Lead

Zinc

Sodium

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

K⁺

Cl¯

S²¯

Ca²⁺

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

Borax

Alum

Gypsum

Calomel

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

Magnesium and chlorine

Potassium only

Magnesium only

Potassium and magnesium

259. 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 sulphate

A nitrate

A bromide

A carbonate

260. Neon glows in discharge tube as

Yellowish

Greenish

Radish

Bluish

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

With alkali metals

None of these

With inert gases

With halogens

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

Li

F

Ne

B

263. 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.

CO₂

Argon

Greater amount of nitrogen molecules derived from N¹⁵ isotope

Some nitrogen molecules analogous to O₂

264. Which one is the biggest ion?

Na⁺

Al³⁺

Mg²⁺

Ba²⁺

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

Strong reducing agents

Strong oxidizing agents

Weak reducing agents

Weak oxidizing agents

266. Which of the following phosphorus is most reactive?

Scarlet phosphorus

Violet phosphorus

White phosphorus

Red phosphorus

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

Sulphur dioxide

Iodide

Carbon dioxide

Chlorine

268. Identify the correct statement

Plaster of Pairs can be obtained by partial oxidation of gypsum

Gypsum contains a lower percentage of calcium than plaster of pairs

Gypsum is obtained by heating plaster of pairs

Plaster of Paris is obtained by partial oxidation of gypsum

269. NaOH is prepared by the method

Castner Kellner cell

Castner cell

Down’s cell

Solvay process

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

Calcium

Barium

Strontium

Beryllium

271. Which is the strongest acid?

HClO₃

HClO₂

HClO

HClO₄

272. 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

200mL

800 mL

273. Heavy water is obtained by

Prolonged electrolysis of water

Dissolving heavy salt in water

Removing impurities of calcium and magnesium form water

Simple distillation of water

274. Identify the incorrect statement with respect to ozone.

Ozone is more reactive than dioxygen

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 diamagnetic whereas dioxygen is paramagnetic

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

Entropy of solution formation

Inter – ionic attraction

Hydration energies of cations

Lattice energy solids

Page 12 of 14

276. Fluorine differs from other halogens due to

High dissociation energy

All

Small size

Low first ionization energy

277. Which noble gas is used in labors?

Krypton

Helium

Argon

Neon

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

Tetra calcium aluminoferrite

Tri-calcium silicate

Tri-calcium aluminate

Diclacium silicate

279. The bleaching action of chlorine is due to

Hydrogenation

Reduction

Chlorination

Oxidation

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

Both have nearly the same size

The ratio of their charge to size is nearly the same

Both have similar electronic configurations

Both are found together in nature

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

Calcium oxide

Sodium bicarbonate

Sodium carbonate

Calcium carbonate

282. Which shows maximum catenation property?

O

Se

S

Te

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

Krypton

Argon

Neon

Helium

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

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

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

There is no change in the nuclear charge

None of these

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

Chlorine

Iodine solution

NaCl

Ki

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

Third

Sixth

Fourth

Fifth

287. Which one of these is most reactive?

Pb

K

Mg

Na

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

Converting silver halides to metallic silver

Preventing overdeveloping and fogging

Dissolving out unreacted silver bromide

Reducing solubility of AgBr

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

Nitrogen is highly soluble in water

Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

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

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

I₂

F₂

Br₂

Cl₂

291. 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

SnO₂

CaO

CO₂

292. Which halogen is most electropositive?

F

I

Cl

Br

293. Oxygen shows oxidation states

-2, +2, +6

+2, +4, +6

-2

+2, -2

294. 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

295. Which of the following has greatest reducing power?

HI

HBr

HCl

296. All halogen are

Oxidizing agents

Reducing agents

Oxidizing as well as reducing agents

Drying agents

297. Mark the smallest atom

F

Br

I

Cl

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

It is used in the formation white cement

It is as filter for soap

It is used as fire proof in textile

It is used furniture polish

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

Lattice energy

Electron affinity

Hydration energy

Ionization energy

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

Boron

Nitrogen

Carbon

Oxygen

Page 13 of 14

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

70.90 g

88.60 g

17.72 g

35.45 g

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

Silica

Magnesia

Alumina

Iron oxide

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

Light metals

Heavy metals

Halogens

Noble gases

304. Strongest reducing agent is

Hl

HBr

HF

HCl

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

Sodium hydride

Sodium nitride

Sodium azide

Sodium amide

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

Weak acid and weak base

Weak acid and strong base

Strong acid and weak base

Strong acid and strong base

307. Electropositive character increase down the group due to

All of these

Decrease in electronegativity of the elements

Decrease in I.P

Increase in atomic size of elements

308. Among noble gases xenon gives compounds due to

Large size

Structure

Higher I-P

Zero electron affinity

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

NaAlO₂

Al₂(OH)₄

Na₃AlO₃

Na₂Al(OH)₄

310. SO3 is not dissolve directly in H2O because

The reaction is quite slow

The reaction is highly exothermic

The reaction does not go to completion

SO₃ is insoluble in H₂O

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

Borazole is polar compound

Borazole is nonpolar compound

Of localized electrons in it

Borazole is electron deficient compound

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

Haber

Castner

Chamber

Solvay

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

Solvay process of sodium carbonate

Iron from haematite

Phosphorus from phosphorite

Ordinary (soda lime) glass

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

Neon

Xenon

Argon

Radon

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

HF molecules form intermolecular H-bonds

Fluorine atom is smaller in size

HF is the weakest acid

Fluorine is highly reactive

316. 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

317. The most powerful oxidizing agent among the halogens is

Br₂

I₂

Cl₂

F₂

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

33%

22%

11%

44%

319. The alkali metals

Show increasing electro negativity from Li to Cs.

Form salt like hydrides

Form salts which are predominantly covalent

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

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

Tetrahedral, acidic

Angular, disc

Linear acidic

Linear, basic

321. Which statement is true about IV A group

Whole group consist of non-metals

Marked change of properties

Abrupt change of properties

There is a regular gradation of properties from top to bottom

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

Magnesium

Phosphorus

Copper

Mercury

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

s-orbitals

None

p-orbitals

d-orbitals

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

Keep away the sharks

Mark the ship lighter

Prevent puncturing by under sea rock

To prevent the action of water and salt

325. The most abundant inert gas in the atmosphere is

Kr

Ar

He

Ne

Page 14 of 14

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

Graphite

Diamond

Coal

Coke

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

He

Ar

Ne

Xe

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

Helium

Neon

Oxygen

Nitrogen

329. An atom with high electro negativity has

Low ionization potential

Large size

Low electron affinity

High ionization potential

330. Permonosulphuric acid is known as

Marshall’s acid

Sulphuric acid

None of these

Carlo’s acid

Total Questions:	330
Time Allowed:	80 Minutes
Total Marks:	330
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry The Halogens and Noble Gases Online Mcqs Test

Important Chemistry The Halogens and Noble Gases Question and Answer

Chemistry The Halogens and Noble Gases Practice Test Online With Explanation

Chemistry

Related Posts

Malik Tahir

2 Comments

Leave a Reply Cancel reply