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MDCAT Chemistry S-Block Elements Test Online

Malik TahirLast Updated: May 24, 2025

Chemistry S-Block Elements MCQS Online Test

MDCAT Chemistry S-Block Elements Chapter Online Test

Total Questions:	155
Time Allowed:	60 Minutes
Total Marks:	155
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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MDCAT Chemistry S-Block Elements Test

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Page 1 of 7

Chemistry

1. Which compound will show the highest lattice energy?

NaF

RbF

CsF

2. Which of the following sulphates is not soluble in water?

Barium sulphate

Potassium sulphate

Sodium sulphate

Zinc sulphate

3. Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

Their atomic size decreases

Their metallic character decreases

Their ionization energy increases

The stability of +2 oxidation state increases

4. The aqueous solution of potash alum is

Basic

None of these

Acidic

Neutral

5. Alkali metal hydroxides are stable to heat except

RbOH

LiOH

NaOH

KOH

6. Substance which is found in dried up lakes of Tibet and California is

Tincal

Colemanite

Boric acid

Calcium carbonate

7. Which of the following statements is not true about potash alum?

Its empirical formula is KAl(SO₄). 12H₂O

Its aqueous sol. Is basic in nature

It is used in dyeing industry

On heating it melts in its water of crystallization

8. What is true about reactivity of aluminum?

None is correct

It reacts with oxygen of air at high temperature (2000c)

It reacts readily with oxygen of the air at room temperature

Its powder form reacts with O₂ and N₂ of air at 800C

9. Bleaching powder is a compound having a formula

CaClO

CaOCl₂

CaCO₃

CaOCl₃

10. The reactivity of the alkali metal sodium with water, is made use of

As a general drying agent

In drying of alcohols

In drying of benzene

In drying of ammonia solution

11. NaNO₃ decomposes on heating at high temperature to give

N₂

Na₂O

O₂

NO₂

12. Amongst the metals Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed by

13. A combustible gas is liberated when caustic soda solution is heated with

I₂

NH₄Cl

14. The element having least value of ionization energy among the following elements is

15. The formula of china clay is

Al₂O₃. 2H₂O

Al₂O₃

Al₂O₃. SiF₄

Al₂O₃. 2SiO₂. 2H₂O

16. Choose the gas among the following which turns line water milky:

NO₂

CO₂

Br₂

17. Sodium conducts electricity because

It has mobile electrons

It gives hydrogen with water

It is a soft alkali metal

It has only one electron in the outermost orbit

18. Which of the following is most dense?

19. Main process for the manufacture of Na₃CO₃ is

Castner process

Nelson process

Down process

Solvay process

20. Which one of the following sulphate is not soluble in water?

Zinc sulphate

Barium sulphate

Sodium sulphate

Potassium sulphate

21. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 3H₂O

Na₂CO₃. 10H₂O

Na₂CO₃. 7H₂O

22. Which of the following compounds has the lowest anion to cation size ratio?

CsF

LiF

NaF

Csl

23. Which of the following is a component of ruby?

Al(OH)₃

MgCO₃

CaCO₃

Al₂O₃

24. Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through A, it turns cloudy. What is the chemical formula of A?

CaO

Ca(HCO₃)₂

CaCO₃

Ca(OH)₂

25. Metallic luster exhibited by Na can be explained by

Existence of body centered cubic lattice

Oscillation of loose electrons

Excitation of free protons

Diffusion of sodium ions

Page 2 of 7

26. Microcosmic salt is

Na(NH₄). H₂O

HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄)HPO₄.4H₂O

27. White lead is

Basic lead carbonate

Basic lead hydroxide

Basic lead acetate

Acidic lead carbonate

28. The substance used as a smoke screen in warfare is

PCl₅

Acetylene

SiCl₄

PH₃

29. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and sand

30. Which of the following is a Lewis acid?

NCl₃

AlCl₃

PCl₃

AsCl₃

31. Which one of the following has the lowest boiling point?

32. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water but readily soluble in hot water

Sparingly soluble in cold water at all temperatures

Highly soluble in water at all temperatures.

Readily soluble in cold water

33. Which is formula of orthoboric acid?

H₆B₄O₉

H₂B₄O₇

HBO₂

H₃BO₃

34. Which is the formula of Chili Salt Peter?

NaNo₃

KNo₃

K₂SO₄

Na₂So₄

35. Down’s cell is used to prepare

Sodium hydroxide

Sodium bicarbonate

Sodium carbonate

Sodium metal

36. Which of the following is most abundant in the earth’s crust?

37. Sodium metal cannot be stored under

Kerosene oil

Benzene

Alcohol

Toluene

38. Sodium reacts with water more vigorously than lithium because

It has higher atomic weight

It is more electronegative

It is more electropositive

It is a metal

39. Which one is formula of borax?

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 10H₂O

40. Which halide has highest melting point?

NaBr

NaCl

NaF

Nal

41. One of the following does not form oxide on heating

Li2 CO₃

Na₂ CO₃

Caco₃

KNo₃

42. The wire in the flash bulbs is made up of

43. Boric acid cannot be used

For washing of eyes

In soda bottles

For enamels and glazes

An antiseptic medicine

44. Aluminum reacts with caustic soda to form

Sodium tetra aluminate

Aluminum hydroxide

Aluminum oxide

Sodium meta-aluminate

45. Which one is not an element of III A group?

Thallium

Gallainm

Aluminum

Polonium

46. Mica and bauxite are ores of

47. Solid CO₂ (dry ice) has a structure just like

Graphite

Diamond

Sulphur

None of these

48. Galena is an ore of

Lead

Tin

Germanium

Gallium

49. The alkali metal that reacts with nitrogen directly to form nitride is

50. Boric acid (H₃BO₃) reacts with NaOH to give a salt.

Na₂HBO₃

H₂BO₃

Na₂B₄O₇

Na₃BO₃

Page 3 of 7

51. In diaphragm cell, hydrogen is discharged by

NaCl

H₂S

HCl

Water

52. Keeping in view the comparison of alkali metals with alkaline earth metals, the alkali metals have

Smaller ionic radii

Greater hardness

Lower ionization energy

High melting point

53. A pseudo solid is

Glass

CaCO₃

Diamond

Rock salt

54. What is true about physical state of borax?

White crystalline solid

None of these

White amorphous solid

White crystalline sublime solid

55. The most abundant element in III A group in earth crust is?

Polonium

Indium

Boron

Aluminum

56. Potassium is kept in

Kerosene

Ammonia

Water

Alcohol

57. Cesium oxide will be

Weakly basic

Very strongly basic

Acidic

Amphoteric

58. Chrome yellow has a formula

PbCrO₄

Pb₃O₄

PbO

PbO₂

59. Which metal is protected by a layer of its own oxide?

60. Graphite is a good conductor of electricity. The reason is that

It has delocalized mobile electron

Carbon atoms of each plane have sp²

There are Van der wall’s forces of attraction between the planes of c atoms

Carbon atoms have covalent bonds

61. Born is soil has been considered micronutrient for

All

Alkalinity of soil

Soil porosity

Proper growth of plants

62. Which electronic configuration corresponds to an element of group IIIA?

1s2 2s2 2p3

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p4

1s2 2s2 2p6 3s2 3p6 4s2 3d1

63. Which of the following gases burns with a blue flame?

CO₂

O₂

N₂

64. The formula of calcium cyanamide is

Ca(CN)₂

CaC₂N

CaCHNH₂

CaNCN

65. Aluminorthermy used for on the spot welding of large iron structure is based upon the fact that

Refraction between aluminum and oxygen is endothermic

As compared to aluminum, iron has greater affinity for oxygen

As compared to iron, aluminum has greater affinity for oxygen

Reaction between iron and oxygen is endothermic

66. Ammonia may be prepared by heating ammonium chloride with

Water

H₂so₄

Aqueous NaoH

NaCl

67. Alkaline earth metals have higher densities, melting and boiling points than alkali metals because of

None of these

High nuclear charge and ionization

High nuclear charge

High ionization potential

68. The halide which is not hydrolyzed is

CCl₄

SiCl₄

SiF₄

PbCl₄

69. Calcium cyananmide on treatment with steam under pressure gives NH₃ and

Calcium hydroxide

Calcium carbonate

Calcium oxide

Calcium bicarbonate

70. The principle constituent of pyrex glass is

71. Plaster of Paris hardens by

Giving out water

Giving off CO₂

Combining with water

Changing into CaCO₃

72. Choose the element which does not belong to group II A of the periodic table

73. Borax is a white crystalline solid and it is

Soluble only in organic solvents

More soluble in cold water

Insoluble in water

More soluble in hot water

74. Which is most abundant alkaline metal in earth crust?

75. Which is the weakest reducing agent?

Page 4 of 7

76. Metals belonging to the same group in the periodic table are

Magnesium and potassium

Magnesium and barium

Magnesium and copper

Magnesium and sodium

77. Which is the chemical formula of mica?

NaAlSiO₄. 3H₂O

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

K2HAL(SiO₄)₃

78. Chile saltpeter has the chemical formula

NaNO₃

Na₂B₄O₇

Na₂CO₃. H₂O

KNO₃

79. Aluminum oxide is

Acidic oxide

Amphoteric oxide

Basic oxide

It does not exists

80. The metal which is used in thermite process because of its activity is

Zinc

Aluminum

Copper

Iron

81. Which of the following in rain water is responsible for weathering of rocks?

Noble gases

CO₂

O₂

N₂

82. The common mineral of alkali metal sodium is borax which has formula.

Na₂B₄O₇.5H₂O

Na₂B₄O₇

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

83. Setting of Plaster of Paris involves

Hydration to yield another hydrate

Oxidation with atmospheric oxygen

Dehydration

Combination with atmospheric CO₂

84. Alum is not used

As a mordant is dyeing

In tanning of leather

In purification of water

As an insecticide

85. Aluminum can jam radar due to

It is a conductor of heat

It is not true

It is a good reflector of radiant energy

It is a conductor of electricity

86. The order of alkali metals is

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

Fr, Li, Rb, K, Na, Cs

Li, Na, K, Rb, Cs, Fr

87. First ionization potential of alkaline earth metal is greater than alkali metals because

They have smaller size

They are more reactive

They have greater atomic size

All

88. Plaster of Paris is a hydrate of

BaSO₄

CaSO₄

MgSO₄

ZnSO₄

89. The element having least value of heat of hydration is

90. Which of the following is most abundant alkali metal in combined state in nature?

s – or – p

d – only

Both d – and f –

f – only

91. Choose the correct statement

Diamond is the hardest and coke is the softest

Coal is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

Diamond is the hardest and graphite is the softest

92. The elements having highest melting point is

93. Causticisation process is used for the preparation of

Caustic potash

Baryata solution

Caustic soda

Slaked lime

94. Gypsum is applied to the soil as a source of

Ca and s

Could not apply

95. Choose the number of group of periodic table to which alkali metals belong to

VIII

IIA

96. Which element is present in excess in skeletal material?

97. Silicon is found in nature in the form of

Only silicates

Oxides

Silica or siticates

Sulphides

98. One of the outstanding features of boron is its ability to form

Semiconductors

Molecular crystals

Molecular addition compounds

Ionic compounds

99. The element having highest electronegativity among the following is

100. Which of the following properties is not true for an alkali metal?

Low electro negativity

Low ionization energy

Low density

Low atomic volume

Page 5 of 7

101. Which of the following is not a use of silicon?

Antifreeze

Lubricants

Hydraulic brakes

Water repellent

102. CO2 is gas while SiO2 is solid at room temperature.

CO2 is an independent molecule while SiO2 has network covalent structure

Carbon is non-metal while silicon is semi-metal

CO2 forms multiple bond while silicon does not form multiple bonds

Silicon has all sigma bonds

103. The chemical formula of bauxite is

Al₂O₃. 2H₂O

None of these

Al₂O₃. SiF₄

Al₂O₃

104. H₃BO₃ is a

None of these

Dibasic acid

Monobasic acid

Tribasic acid

105. The elements which are very abundant I earth are

Ca and Mg

All

Si and Al

B and a

106. In the manufacture of cement which of the following is used?

Lime stone and gypsum

Clay and silica

Lime stone and clay

Lime stone and silica

107. Red lead is

PbO

Pb₄O₃

Pb₃O₄

PbO₂

108. The word alkali means

Ashes

Spirit

Base

Base salt

109. Which of the following imparts violet colouration to the non-luminous flame of Bunsen burner?

NaCl

KCl

BaCl₂

CaCl₂

110. Setting of cement is an

Endothermic reaction

None

Neither exothermic nor endothermic

Exothermic reaction

111. Choose the compound which decomposes on heating similar to LiNO₃

Mg(NO₃)₂

All above

Sr(NO₃)₂

Be(NO₃)₂

112. The oxides of beryllium are

Basic

Acidic

None of these

Amphoteric

113. The formula of Nitre is

Na₂CO₃

NaCl

KNO₃

NaNO₂

114. Which one does not belong to alkaline earth metal?

115. Anodizing of Al is said when

Aluminum coated electrically with aluminum oxide

Aluminum obtained at anode

Aluminum prepared electrolytically

Aluminum allay containing 95% Al

116. Dolomite has the composition

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

CaCO₃.MgCO₃

KCL.MgCL₂.6H₂O

117. Alkali earth metals have two electrons outermost

f-orbital

p-orbital

s-orbital

d-orbital

118. Which is the chemical formula of zircon?

ZrSiO₄

Al₂F₂SiO₄

Na₃AlF₆

H₂Mg₃(SiO₃)₄

119. Al is more reactive than Fe but Al is less easily corroded than Fe because

It is a noble metal

Fe form mono and divalent ions

Oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

120. The chief are of aluminum is

Al₂O₃. H₂O

Al₂O₃.₂H₂O

Al₂O₃

Na₃ALF₆

121. Which one of the following gives white precipitate with aqueous BaCl₂?

Na₂co₃

NaNo₃

None

naHco₃

122. Which of the most basic of the following?

Na₂O

As₂O₃

Al₂O₃

BaO

123. Point out one of the following which shows moderate electrical conductivity:

Diamond

Carbrandum

Silica

Graphite

124. BF₃ acts as acid according to the concept of

Bronsted

None

Arrhenius

Lewis

125. Chile Salt peter is

Na₂S₂O₃

NaNO₃

KNO₃

Na₂SO₄

Page 6 of 7

126. Ordinary window glass is a mixture of

Na₂SiO₃ and SiO₂

Na₂CiO₃ and CO₂

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

127. Nitrates of which elements give same products

Li, Mg, Ca

All have same products

Li, Na, Be

Li, Na, K

128. Which of the following is monovalent?

Alkaline earth metals

Alkali metals

Metals

Metalloids

129. Which element is used in thermite process due to its reactivity?

130. Because of its ability to combine with both oxygen and nitrogen aluminum metal is used

To produce alloy

As nitro meter

As insulator

To remove air bubbles from molten metal

131. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

Na₂CO₃

PbO

Pb₃O₄

132. Bleaching action of bleaching powder is due to the liberation of

Cl¯

O₂

OCl¯

Cl₂

133. The process of aluminum extraction is called

Hall process

Haber process

Contact process

Termite process

134. Which of the following conceivable structures for CCl₄ will have a zero dipole moment?

Square planar

Irregular tetrahedron

Square pyramid (carbon at apex)

None of these

135. When excess of SnCl₂ is added to a solution of HgCl₂, a white precipitate turning to grey is obtained. This grey colour is due to the formation of

Hg₂Cl₂

SnCl₄

136. Which of the following alkali metal hydroxides is the strongest base?

NaOH

KOH

CsOH

LiOH

137. The purification method of bauxite containing iron oxide as impurity is known as

Hoop’s process

Serpeck’s process

Baeyer’s process

Electrolytic process

138. The oxides of born and silicon are

Acidic solution

Natural

Amphoteric

Basic

139. AlCl₃ exist as dimmer because

High charge in nucleus

Al has larger radius

Al has greater ionization potential

Incomplete p-subshell

140. Magnesium keeps on burning in

N₂ as well as CO₂

N₂

N₂O

CO₂

141. The formula of sodium meta borate is

Na₂B₄O₇

Na₃BO₃

NaBO₂

NaBO₃

142. In which of the following elements + 1 oxidation state is more stable than +3

143. Which is the most amphoteric?

Al₂O₃

MgO

Na₂O

CaO

144. The elements which belong to group IIIA are called

F – block

S – block

D – block

P – block

145. Leblanc process is employed in the manufacture of

Potash

Washing soda

Baking soda

Plaster of Paris

146. Which one of the following substances conducts electricity by the movement of ions?

Graphite

Mercury

Copper

Molten NaCl

147. With the increase in atomic weights, melting points of the alkali metals

Decrease

Increase

Remain constant

Do not show definite trend

148. Silicon is an important constituent of

Rocks

Chlorophyll

Haemoglbin

Amalgams

149. Special features of borate glass is that it is

Used to prepare chemical garden

Green in colour

Heat resistant

Low melting

150. Among the following oxides, the one which is most basic is

Zinc oxide

Magnesium oxide

Aluminum oxide

Nitrogen pent oxide

Page 7 of 7

151. Which of the following is different from the other three oxides?

ZnO

MgO

Cr₂O₃

SnO

152. The solubility of aluminum hydroxide in sodium hydroxide solution is due to formation of

Sodium aluminum hydroxide

Sodium meta aluminate

Aluminum peroxide

Sodium aluminum hydride

153. Which of the following mineral does not contain Al?

Mica

Cryolite

Fluorspar

Feldspar

154. Alkali and alkaline earth metals show increasing trend down the group in

Electropositivity

All above

Atomic volume

Atomic radii

155. The chloride of an element A gives a neutral solution in water. In the periodic table, the element A belongs to

First group

Third group

Fifth group

First transition series

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Malik TahirLast Updated: May 24, 2025

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5 Comments

Faheem says:

August 5, 2021 at 12:07 pm

Good

HADIA KARIM says:

November 4, 2020 at 1:31 pm

chile saltpetre has chemical formula=NaNO3 it’s A

ismail says:

September 18, 2020 at 10:54 pm

i want to solve all sort of tests fo biology chemistry and physicsplease guide me

ismail says:

September 18, 2020 at 10:53 pm

i want to solve all sort of tests fo biology chemistry and physics

ismail says:

September 18, 2020 at 10:52 pm

i want to solve all sort of tests

MDCAT Chemistry S-Block Elements Test Online

Chemistry S-Block Elements MCQS Online Test

MDCAT Chemistry S-Block Elements Chapter Online Test

MDCAT Chemistry S-Block Elements Test

Chemistry

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Chemistry S-Block Elements MCQS Online Test

MDCAT Chemistry S-Block Elements Chapter Online Test

MDCAT Chemistry S-Block Elements Test

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