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Chemistry S-Block Elements Online Mcqs Test

Malik TahirLast Updated: October 14, 2025

Important Chemistry S-Block Elements Question and Answer

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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Chemistry S-Block Elements Practice Test Online With Explanation

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Page 1 of 7

Chemistry

1. Which of the following is monovalent?

Alkali metals

Metals

Alkaline earth metals

Metalloids

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

Calcium hydroxide

Calcium carbonate

Calcium oxide

Calcium bicarbonate

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

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

Magnesium and sodium

Magnesium and barium

Magnesium and potassium

Magnesium and copper

5. Plaster of Paris is a hydrate of

MgSO₄

CaSO₄

ZnSO₄

BaSO₄

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

High nuclear charge

High nuclear charge and ionization

High ionization potential

None of these

7. Anodizing of Al is said when

Aluminum allay containing 95% Al

Aluminum obtained at anode

Aluminum coated electrically with aluminum oxide

Aluminum prepared electrolytically

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

Molten NaCl

Copper

Graphite

Mercury

9. Galena is an ore of

Lead

Gallium

Germanium

Tin

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

Oxygen forms a protective reaction easily with water

It is a noble metal

Iron undergoes reaction easily with water

Fe form mono and divalent ions

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

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

13. The element having highest electronegativity among the following is

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

Na₂ CO₃

Li2 CO₃

KNo₃

Caco₃

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

Low ionization energy

Low atomic volume

Low electro negativity

Low density

16. The oxides of born and silicon are

Acidic solution

Basic

Natural

Amphoteric

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

Na₂B₄O₇

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

Na₂B₄O₇.5H₂O

18. Which is formula of orthoboric acid?

H₆B₄O₉

H₂B₄O₇

H₃BO₃

HBO₂

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

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

In drying of benzene

As a general drying agent

In drying of ammonia solution

In drying of alcohols

21. Washing soda has formula

Na₂CO₃. 3H₂O

Na₂CO₃. 10H₂O

Na₂CO₃.

Na₂CO₃. 7H₂O

22. Which of the most basic of the following?

As₂O₃

Al₂O₃

Na₂O

BaO

23. H₃BO₃ is a

Dibasic acid

Monobasic acid

None of these

Tribasic acid

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

naHco₃

NaNo₃

Na₂co₃

None

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

Carbon atoms of each plane have sp²

It has delocalized mobile electron

Carbon atoms have covalent bonds

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

Page 2 of 7

26. Choose the correct statement

Diamond is the hardest and coke is the softest

Coal is the hardest and coke is the softest

Diamond is the hardest and graphite is the softest

Graphite is the hardest which lamp black is the softest

27. Cesium oxide will be

Amphoteric

Acidic

Weakly basic

Very strongly basic

28. Chile saltpeter has the chemical formula

Na₂CO₃. H₂O

Na₂B₄O₇

KNO₃

NaNO₃

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

Indium

Polonium

Boron

Aluminum

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

31. Sodium metal cannot be stored under

Benzene

Kerosene oil

Alcohol

Toluene

32. The halide which is not hydrolyzed is

CCl₄

SiF₄

PbCl₄

SiCl₄

33. 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

On heating it melts in its water of crystallization

It is used in dyeing industry

34. Portland cement is manufactured by using

Limestone, gypsum and alumina

Limestone, clay and sand

Limestone, gypsum and sand

Limestone, clay and gypsum

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

36. The elements which belong to group IIIA are called

D – block

F – block

S – block

P – block

37. Dolomite has the composition

Na₃AIF₆

KCL.MgCL₂.6H₂O

CaCl₂.MgCl₂.6H₂O

CaCO₃.MgCO₃

38. The word alkali means

Base

Base salt

Spirit

Ashes

39. The formula of Nitre is

NaCl

Na₂CO₃

KNO₃

NaNO₂

40. Which of the following is most dense?

41. 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?

CaCO₃

Ca(HCO₃)₂

Ca(OH)₂

CaO

42. Sodium reacts with water more vigorously than lithium because

It is more electronegative

It has higher atomic weight

It is more electropositive

It is a metal

43. What is true about solubility of orthoboric acid?

Readily soluble in cold water

Sparingly soluble in cold water at all temperatures

Sparingly soluble in cold water but readily soluble in hot water

Highly soluble in water at all temperatures.

44. Which compound will show the highest lattice energy?

CsF

NaF

RbF

45. What is true about physical state of borax?

White crystalline solid

White crystalline sublime solid

White amorphous solid

None of these

46. Metallic luster exhibited by Na can be explained by

Diffusion of sodium ions

Existence of body centered cubic lattice

Excitation of free protons

Oscillation of loose electrons

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

Sodium aluminum hydroxide

Aluminum peroxide

Sodium aluminum hydride

Sodium meta aluminate

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

SnO

Cr₂O₃

MgO

ZnO

49. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is a conductor of electricity

It is a conductor of heat

It is not true

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

Silicon has all sigma bonds

CO2 forms multiple bond while silicon does not form multiple bonds

CO2 is an independent molecule while SiO2 has network covalent structure

Carbon is non-metal while silicon is semi-metal

Page 3 of 7

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

Silica

Carbrandum

Graphite

Diamond

52. Main process for the manufacture of Na₃CO₃ is

Castner process

Solvay process

Nelson process

Down process

53. Potassium is kept in

Kerosene

Alcohol

Water

Ammonia

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

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

1s2 2s2 2p4

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p3

55. What is true about reactivity of aluminum?

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

None is correct

It reacts readily with oxygen of the air at room temperature

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

56. Silicon is an important constituent of

Haemoglbin

Amalgams

Chlorophyll

Rocks

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

Colemanite

Tincal

Boric acid

Calcium carbonate

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

59. Alkali metal hydroxides are stable to heat except

LiOH

KOH

RbOH

NaOH

60. Chrome yellow has a formula

PbCrO₄

PbO

PbO₂

Pb₃O₄

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

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

Al₂O₃

MgCO₃

Al(OH)₃

CaCO₃

63. Setting of cement is an

None

Endothermic reaction

Exothermic reaction

Neither exothermic nor endothermic

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

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

Atomic volume

Electropositivity

All above

Atomic radii

66. The formula of sodium meta borate is

NaBO₃

NaBO₂

Na₂B₄O₇

Na₃BO₃

67. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. SiF₄

Al₂O₃

Al₂O₃. 2H₂O

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

Gallainm

Thallium

Polonium

Aluminum

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

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

To produce alloy

To remove air bubbles from molten metal

As insulator

As nitro meter

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

Feldspar

Fluorspar

Cryolite

Mica

72. 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

73. The oxides of beryllium are

Amphoteric

Basic

None of these

Acidic

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

Na₂HBO₃

Na₃BO₃

Na₂B₄O₇

H₂BO₃

75. Which of the following is a Lewis acid?

AsCl₃

NCl₃

AlCl₃

PCl₃

Page 4 of 7

76. The process of aluminum extraction is called

Termite process

Hall process

Contact process

Haber process

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

N₂

Noble gases

O₂

CO₂

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

79. The elements which are very abundant I earth are

B and a

All

Ca and Mg

Si and Al

80. Chile Salt peter is

KNO₃

Na₂SO₄

Na₂S₂O₃

NaNO₃

81. Born is soil has been considered micronutrient for

Soil porosity

Proper growth of plants

Alkalinity of soil

All

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

Aluminum

Copper

Iron

Zinc

83. Mica and bauxite are ores of

84. Plaster of Paris hardens by

Giving off CO₂

Combining with water

Giving out water

Changing into CaCO₃

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

Br₂

NO₂

CO₂

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

CsF

LiF

NaF

Csl

87. Which one is formula of borax?

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 4G₂O

NaOH. B₂O₃

Na₂B₄O₇. 10H₂O

88. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

PbO

Na₂CO₃

Pb₃O₄

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

Lime stone and clay

Lime stone and gypsum

Lime stone and silica

Clay and silica

90. Setting of Plaster of Paris involves

Dehydration

Oxidation with atmospheric oxygen

Combination with atmospheric CO₂

Hydration to yield another hydrate

91. NaNO₃ decomposes on heating at high temperature to give

O₂

NO₂

Na₂O

N₂

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

Semiconductors

Molecular crystals

Ionic compounds

Molecular addition compounds

93. Silicon is found in nature in the form of

Silica or siticates

Only silicates

Oxides

Sulphides

94. Down’s cell is used to prepare

Sodium metal

Sodium carbonate

Sodium bicarbonate

Sodium hydroxide

95. Which is the weakest reducing agent?

96. Red lead is

Pb₄O₃

PbO₂

Pb₃O₄

PbO

97. Aluminum oxide is

Basic oxide

It does not exists

Acidic oxide

Amphoteric oxide

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

They have greater atomic size

All

They have smaller size

They are more reactive

99. Which is the formula of Chili Salt Peter?

Na₂So₄

NaNo₃

KNo₃

K₂SO₄

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

Nitrogen pent oxide

Zinc oxide

Aluminum oxide

Magnesium oxide

Page 5 of 7

101. In diaphragm cell, hydrogen is discharged by

Water

HCl

NaCl

H₂S

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

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

f – only

s – or – p

d – only

Both d – and f –

104. The aqueous solution of potash alum is

Neutral

Acidic

Basic

None of these

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

106. Microcosmic salt is

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

107. Special features of borate glass is that it is

Low melting

Used to prepare chemical garden

Green in colour

Heat resistant

108. Alkali earth metals have two electrons outermost

p-orbital

s-orbital

d-orbital

f-orbital

109. 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

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

NH₄Cl

I₂

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

Fifth group

First group

First transition series

Third group

112. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

Na₂O and SiO₂

Na₂SiO₃ and SiO₂

113. Which is the most amphoteric?

CaO

Al₂O₃

Na₂O

MgO

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

Hydraulic brakes

Lubricants

Antifreeze

Water repellent

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

Ca and s

Could not apply

116. Ammonia may be prepared by heating ammonium chloride with

H₂so₄

Water

NaCl

Aqueous NaoH

117. The chemical formula of bauxite is

Al₂O₃. SiF₄

None of these

Al₂O₃

Al₂O₃. 2H₂O

118. The formula of calcium cyanamide is

CaC₂N

Ca(CN)₂

CaNCN

CaCHNH₂

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

120. Leblanc process is employed in the manufacture of

Baking soda

Washing soda

Potash

Plaster of Paris

121. Boric acid cannot be used

For enamels and glazes

In soda bottles

An antiseptic medicine

For washing of eyes

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

Serpeck’s process

Electrolytic process

Baeyer’s process

Hoop’s process

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

Be(NO₃)₂

Sr(NO₃)₂

Mg(NO₃)₂

All above

124. Bleaching powder is a compound having a formula

CaOCl₂

CaOCl₃

CaClO

CaCO₃

125. Causticisation process is used for the preparation of

Caustic potash

Baryata solution

Caustic soda

Slaked lime

Page 6 of 7

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

Reaction between iron and oxygen is endothermic

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

127. The chief are of aluminum is

Al₂O₃.₂H₂O

Na₃ALF₆

Al₂O₃. H₂O

Al₂O₃

128. AlCl₃ exist as dimmer because

Incomplete p-subshell

Al has larger radius

Al has greater ionization potential

High charge in nucleus

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

Greater hardness

High melting point

Smaller ionic radii

Lower ionization energy

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

Sodium sulphate

Zinc sulphate

Potassium sulphate

Barium sulphate

131. Alum is not used

In tanning of leather

As an insecticide

In purification of water

As a mordant is dyeing

132. The principle constituent of pyrex glass is

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

BaCl₂

KCl

NaCl

CaCl₂

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

Zinc sulphate

Barium sulphate

Potassium sulphate

Sodium sulphate

135. BF₃ acts as acid according to the concept of

Bronsted

Arrhenius

Lewis

None

136. Aluminum reacts with caustic soda to form

Aluminum hydroxide

Sodium tetra aluminate

Sodium meta-aluminate

Aluminum oxide

137. Magnesium keeps on burning in

N₂ as well as CO₂

N₂O

CO₂

N₂

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

N₂

CO₂

O₂

139. Nitrates of which elements give same products

Li, Na, K

Li, Mg, Ca

Li, Na, Be

All have same products

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

Decrease

Remain constant

Increase

Do not show definite trend

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

Diamond

None of these

Sulphur

Graphite

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

VIII

IIA

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

CsOH

NaOH

LiOH

KOH

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

PH₃

PCl₅

Acetylene

SiCl₄

145. A pseudo solid is

Glass

Diamond

CaCO₃

Rock salt

146. Sodium conducts electricity because

It is a soft alkali metal

It has mobile electrons

It has only one electron in the outermost orbit

It gives hydrogen with water

147. Which halide has highest melting point?

NaCl

NaBr

NaF

Nal

148. 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 metallic character decreases

Their atomic size decreases

Their ionization energy increases

The stability of +2 oxidation state increases

149. The elements having highest melting point is

150. Which is the chemical formula of zircon?

ZrSiO₄

Al₂F₂SiO₄

Na₃AlF₆

H₂Mg₃(SiO₃)₄

Page 7 of 7

151. Borax is a white crystalline solid and it is

Insoluble in water

More soluble in hot water

More soluble in cold water

Soluble only in organic solvents

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

Square pyramid (carbon at apex)

Square planar

Irregular tetrahedron

None of these

153. Which is the chemical formula of mica?

NaAlSiO₄. 3H₂O

NaKSiO₄. 10H₂O

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

154. White lead is

Acidic lead carbonate

Basic lead carbonate

Basic lead hydroxide

Basic lead acetate

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

O₂

Cl¯

OCl¯

Cl₂

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Malik TahirLast Updated: October 14, 2025

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

Chemistry S-Block Elements Online Mcqs Test

Important Chemistry S-Block Elements Question and Answer

Chemistry S-Block Elements Practice Test Online With Explanation

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