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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. The process of aluminum extraction is called

Termite process

Hall process

Haber process

Contact process

2. The elements which belong to group IIIA are called

P – block

D – block

F – block

S – block

3. Which is the chemical formula of zircon?

Na₃AlF₆

H₂Mg₃(SiO₃)₄

Al₂F₂SiO₄

ZrSiO₄

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

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

Fe form mono and divalent ions

Iron undergoes reaction easily with water

It is a noble metal

Oxygen forms a protective reaction easily with water

6. 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

7. Which compound will show the highest lattice energy?

NaF

RbF

CsF

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

9. The order of alkali metals is

Li, Na, Cs, K, Rb, Fr

Na, K, Li, Rb, Fe, Cs

Fr, Li, Rb, K, Na, Cs

Li, Na, K, Rb, Cs, Fr

10. 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

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

N₂

O₂

Noble gases

CO₂

12. Boric acid cannot be used

For enamels and glazes

An antiseptic medicine

In soda bottles

For washing of eyes

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

IIA

VIII

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

Mercury

Molten NaCl

Graphite

Copper

15. The element having highest electronegativity among the following is

16. Alum is not used

In purification of water

As a mordant is dyeing

As an insecticide

In tanning of leather

17. Which of the following is monovalent?

Alkali metals

Alkaline earth metals

Metalloids

Metals

18. What is true about solubility of orthoboric acid?

Highly soluble in water at all temperatures.

Sparingly soluble in cold water at all temperatures

Readily soluble in cold water

Sparingly soluble in cold water but readily soluble in hot water

19. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and sand

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

Do not show definite trend

Decrease

Increase

Remain constant

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

NH₄Cl

I₂

22. Bleaching powder is a compound having a formula

CaOCl₃

CaCO₃

CaOCl₂

CaClO

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

Ca and s

Could not apply

24. Down’s cell is used to prepare

Sodium bicarbonate

Sodium metal

Sodium carbonate

Sodium hydroxide

25. Mica and bauxite are ores of

Page 2 of 7

26. 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

SnCl₄

Hg₂Cl₂

27. Red lead is

PbO₂

Pb₄O₃

PbO

Pb₃O₄

28. Born is soil has been considered micronutrient for

Alkalinity of soil

All

Proper growth of plants

Soil porosity

29. Alkali metal hydroxides are stable to heat except

RbOH

KOH

NaOH

LiOH

30. Aluminum oxide is

It does not exists

Acidic oxide

Basic oxide

Amphoteric oxide

31. What is true about reactivity of aluminum?

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

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

32. Metallic luster exhibited by Na can be explained by

Excitation of free protons

Oscillation of loose electrons

Existence of body centered cubic lattice

Diffusion of sodium ions

33. Chile Salt peter is

NaNO₃

Na₂SO₄

Na₂S₂O₃

KNO₃

34. The formula of calcium cyanamide is

CaC₂N

CaNCN

Ca(CN)₂

CaCHNH₂

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

Square planar

Square pyramid (carbon at apex)

Irregular tetrahedron

None of these

36. Which is the most amphoteric?

Al₂O₃

Na₂O

CaO

MgO

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

Cr₂O₃

SnO

MgO

ZnO

38. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

NaCl

H₂so₄

Water

39. Anodizing of Al is said when

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

Aluminum obtained at anode

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

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

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

Boric acid

Tincal

Calcium carbonate

Colemanite

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

Zinc sulphate

Potassium sulphate

Barium sulphate

Sodium sulphate

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

Carbon is non-metal while silicon is semi-metal

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

45. 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 iron, aluminum has greater affinity for oxygen

Reaction between iron and oxygen is endothermic

As compared to aluminum, iron has greater affinity for oxygen

46. The formula of china clay is

Al₂O₃

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

47. AlCl₃ exist as dimmer because

Al has larger radius

Incomplete p-subshell

High charge in nucleus

Al has greater ionization potential

48. Silicon is an important constituent of

Rocks

Chlorophyll

Haemoglbin

Amalgams

49. 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 ionization energy increases

The stability of +2 oxidation state increases

Their metallic character decreases

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

Page 3 of 7

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

Greater hardness

Lower ionization energy

High melting point

Smaller ionic radii

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

Copper

Aluminum

Iron

Zinc

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

Carbon atoms of each plane have sp²

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

It has delocalized mobile electron

Carbon atoms have covalent bonds

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

55. The oxides of beryllium are

Acidic

Amphoteric

Basic

None of these

56. The oxides of born and silicon are

Amphoteric

Natural

Basic

Acidic solution

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

Hydraulic brakes

Antifreeze

Lubricants

Water repellent

58. Aluminum can jam radar due to

It is not true

It is a conductor of electricity

It is a conductor of heat

It is a good reflector of radiant energy

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

Polonium

Aluminum

Thallium

Gallainm

60. Dolomite has the composition

CaCO₃.MgCO₃

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

KCL.MgCL₂.6H₂O

61. Magnesium keeps on burning in

N₂ as well as CO₂

N₂

N₂O

CO₂

62. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

NaAlSiO₄. 3H₂O

NaKSiO₄. 10H₂O

63. The elements having highest melting point is

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

Low electro negativity

Low ionization energy

Low atomic volume

Low density

65. Sodium reacts with water more vigorously than lithium because

It is more electropositive

It is a metal

It has higher atomic weight

It is more electronegative

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

O₂

N₂

CO₂

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

naHco₃

None

NaNo₃

Na₂co₃

68. Chile saltpeter has the chemical formula

NaNO₃

KNO₃

Na₂CO₃. H₂O

Na₂B₄O₇

69. Which is formula of orthoboric acid?

H₆B₄O₉

H₃BO₃

H₂B₄O₇

HBO₂

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

Potassium sulphate

Sodium sulphate

Zinc sulphate

Barium sulphate

71. White lead is

Basic lead acetate

Acidic lead carbonate

Basic lead hydroxide

Basic lead carbonate

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

Lime stone and clay

Lime stone and silica

Clay and silica

Lime stone and gypsum

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

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

75. Nitrates of which elements give same products

Li, Mg, Ca

Li, Na, K

All have same products

Li, Na, Be

Page 4 of 7

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

Diamond

Sulphur

None of these

Graphite

77. Special features of borate glass is that it is

Low melting

Heat resistant

Used to prepare chemical garden

Green in colour

78. What is true about physical state of borax?

White crystalline solid

None of these

White crystalline sublime solid

White amorphous solid

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

All above

Electropositivity

Atomic volume

Atomic radii

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

As nitro meter

To remove air bubbles from molten metal

As insulator

To produce alloy

81. Setting of Plaster of Paris involves

Dehydration

Hydration to yield another hydrate

Combination with atmospheric CO₂

Oxidation with atmospheric oxygen

82. Silicon is found in nature in the form of

Oxides

Sulphides

Only silicates

Silica or siticates

83. Sodium conducts electricity because

It gives hydrogen with water

It has only one electron in the outermost orbit

It is a soft alkali metal

It has mobile electrons

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

PCl₅

PH₃

SiCl₄

Acetylene

85. Plaster of Paris is a hydrate of

CaSO₄

ZnSO₄

BaSO₄

MgSO₄

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

NaCl

KCl

CaCl₂

BaCl₂

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

Ionic compounds

Molecular crystals

Semiconductors

Molecular addition compounds

88. Plaster of Paris hardens by

Giving out water

Giving off CO₂

Changing into CaCO₃

Combining with water

89. The principle constituent of pyrex glass is

90. The chemical formula of bauxite is

Al₂O₃. SiF₄

Al₂O₃

None of these

Al₂O₃. 2H₂O

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

Br₂

NO₂

CO₂

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

Magnesium and sodium

Magnesium and barium

Magnesium and copper

Magnesium and potassium

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

In drying of alcohols

In drying of benzene

In drying of ammonia solution

As a general drying agent

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

Calcium bicarbonate

Calcium carbonate

Calcium oxide

Calcium hydroxide

95. BF₃ acts as acid according to the concept of

Bronsted

Lewis

None

Arrhenius

96. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 7H₂O

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

97. The halide which is not hydrolyzed is

CCl₄

PbCl₄

SiCl₄

SiF₄

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

99. The elements which are very abundant I earth are

Si and Al

B and a

Ca and Mg

All

100. Borax is a white crystalline solid and it is

More soluble in cold water

Soluble only in organic solvents

More soluble in hot water

Insoluble in water

Page 5 of 7

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

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

First group

Fifth group

First transition series

Third group

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

104. Main process for the manufacture of Na₃CO₃ is

Nelson process

Castner process

Solvay process

Down process

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

They are more reactive

They have greater atomic size

All

They have smaller size

106. H₃BO₃ is a

Dibasic acid

Tribasic acid

Monobasic acid

None of these

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

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

108. The chief are of aluminum is

Al₂O₃. H₂O

Al₂O₃.₂H₂O

Al₂O₃

Na₃ALF₆

109. In diaphragm cell, hydrogen is discharged by

Water

H₂S

HCl

NaCl

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

Nitrogen pent oxide

Zinc oxide

Aluminum oxide

Magnesium oxide

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

Both d – and f –

f – only

d – only

s – or – p

112. Sodium metal cannot be stored under

Alcohol

Kerosene oil

Benzene

Toluene

113. Which of the following is a Lewis acid?

PCl₃

AsCl₃

AlCl₃

NCl₃

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

Cryolite

Feldspar

Fluorspar

Mica

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

116. Setting of cement is an

Neither exothermic nor endothermic

None

Endothermic reaction

Exothermic reaction

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

CsOH

KOH

NaOH

LiOH

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

Al(OH)₃

MgCO₃

Al₂O₃

CaCO₃

119. Galena is an ore of

Gallium

Germanium

Lead

Tin

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

Silica

Diamond

Carbrandum

Graphite

121. The aqueous solution of potash alum is

None of these

Acidic

Neutral

Basic

122. Aluminum reacts with caustic soda to form

Sodium tetra aluminate

Sodium meta-aluminate

Aluminum hydroxide

Aluminum oxide

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

124. Which halide has highest melting point?

NaCl

NaBr

NaF

Nal

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

CsF

LiF

NaF

Csl

Page 6 of 7

126. Causticisation process is used for the preparation of

Baryata solution

Caustic potash

Slaked lime

Caustic soda

127. NaNO₃ decomposes on heating at high temperature to give

NO₂

N₂

Na₂O

O₂

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

1s2 2s2 2p4

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p3

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

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

130. Potassium is kept in

Alcohol

Ammonia

Kerosene

Water

131. Which one is formula of borax?

NaOH. B₂O₃

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 4G₂O

Na₂B₄O₇. 10H₂O

132. Chrome yellow has a formula

Pb₃O₄

PbO

PbCrO₄

PbO₂

133. Cesium oxide will be

Acidic

Very strongly basic

Weakly basic

Amphoteric

134. A pseudo solid is

CaCO₃

Rock salt

Diamond

Glass

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

Na₂HBO₃

Na₂B₄O₇

Na₃BO₃

H₂BO₃

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

Cl¯

OCl¯

O₂

Cl₂

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

Na₂ CO₃

Caco₃

Li2 CO₃

KNo₃

138. The formula of sodium meta borate is

NaBO₂

Na₃BO₃

NaBO₃

Na₂B₄O₇

139. Ordinary window glass is a mixture of

Na₂O and SiO₂

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

Na₂SiO₃ and SiO₂

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

Its aqueous sol. Is basic in nature

It is used in dyeing industry

Its empirical formula is KAl(SO₄). 12H₂O

On heating it melts in its water of crystallization

141. Which is the weakest reducing agent?

142. Microcosmic salt is

K(NH₄)HPO₃. 2H₂O

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

143. Choose the correct statement

Diamond 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

Coal is the hardest and coke is the softest

144. Which of the most basic of the following?

As₂O₃

BaO

Al₂O₃

Na₂O

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

Serpeck’s process

Electrolytic process

Baeyer’s process

Hoop’s process

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

Boron

Indium

Aluminum

Polonium

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

Be(NO₃)₂

Sr(NO₃)₂

All above

Mg(NO₃)₂

148. The word alkali means

Base

Base salt

Spirit

Ashes

149. The formula of Nitre is

KNO₃

Na₂CO₃

NaNO₂

NaCl

150. Leblanc process is employed in the manufacture of

Plaster of Paris

Potash

Baking soda

Washing soda

Page 7 of 7

151. 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?

Ca(HCO₃)₂

Ca(OH)₂

CaO

CaCO₃

152. Alkali earth metals have two electrons outermost

d-orbital

p-orbital

f-orbital

s-orbital

153. Which of the following is most dense?

154. Which is the formula of Chili Salt Peter?

NaNo₃

KNo₃

Na₂So₄

K₂SO₄

155. The chemical composition of white lead is

Pb₃O₄

Pb(OH)₂.2PbCO₃

PbO

Na₂CO₃

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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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