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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. Metallic luster exhibited by Na can be explained by

Diffusion of sodium ions

Excitation of free protons

Oscillation of loose electrons

Existence of body centered cubic lattice

2. The formula of calcium cyanamide is

CaCHNH₂

Ca(CN)₂

CaNCN

CaC₂N

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 ionization energy increases

Their metallic character decreases

Their atomic size decreases

The stability of +2 oxidation state increases

4. Setting of cement is an

Exothermic reaction

Neither exothermic nor endothermic

None

Endothermic reaction

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

1s2 2s2 2p6 3s2 3p1

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

1s2 2s2 2p3

1s2 2s2 2p4

6. NaNO₃ decomposes on heating at high temperature to give

NO₂

O₂

N₂

Na₂O

7. Which is the formula of Chili Salt Peter?

NaNo₃

KNo₃

Na₂So₄

K₂SO₄

8. Ammonia may be prepared by heating ammonium chloride with

NaCl

Water

H₂so₄

Aqueous NaoH

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

Br₂

CO₂

NO₂

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

KCl

CaCl₂

NaCl

BaCl₂

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

Polonium

Gallainm

Thallium

Aluminum

12. Chile saltpeter has the chemical formula

KNO₃

Na₂B₄O₇

NaNO₃

Na₂CO₃. H₂O

13. Sodium reacts with water more vigorously than lithium because

It is a metal

It has higher atomic weight

It is more electropositive

It is more electronegative

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

Na₂B₄O₇. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₃O₆. 10H₂O

15. Boric acid cannot be used

An antiseptic medicine

In soda bottles

For washing of eyes

For enamels and glazes

16. The chemical formula of bauxite is

Al₂O₃. 2H₂O

None of these

Al₂O₃

Al₂O₃. SiF₄

17. The oxides of beryllium are

Amphoteric

None of these

Basic

Acidic

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

19. Borax is a white crystalline solid and it is

More soluble in cold water

Insoluble in water

Soluble only in organic solvents

More soluble in hot water

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

Could not apply

Ca and s

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

Low electro negativity

Low density

Low ionization energy

Low atomic volume

22. 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

CaO

Ca(HCO₃)₂

Ca(OH)₂

23. What is true about reactivity of aluminum?

It reacts readily with oxygen of the air at room temperature

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

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

None is correct

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

Calcium oxide

Calcium carbonate

Calcium bicarbonate

Calcium hydroxide

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

None of these

Square planar

Irregular tetrahedron

Square pyramid (carbon at apex)

Page 2 of 7

26. The elements having highest melting point is

27. Dolomite has the composition

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

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

CO₂

Noble gases

N₂

O₂

29. The order of alkali metals is

Fr, Li, Rb, K, Na, Cs

Li, Na, K, Rb, Cs, Fr

Li, Na, Cs, K, Rb, Fr

Na, K, Li, Rb, Fe, Cs

30. Which is the chemical formula of mica?

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

NaAlSiO₄. 3H₂O

K2HAL(SiO₄)₃

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

NH₄Cl

I₂

32. Which is the most amphoteric?

CaO

MgO

Na₂O

Al₂O₃

33. Nitrates of which elements give same products

All have same products

Li, Mg, Ca

Li, Na, Be

Li, Na, K

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

Na₂co₃

None

naHco₃

NaNo₃

35. The elements which belong to group IIIA are called

D – block

P – block

F – block

S – block

36. Mica and bauxite are ores of

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

38. Which of the following is monovalent?

Metals

Metalloids

Alkaline earth metals

Alkali metals

39. Chile Salt peter is

Na₂S₂O₃

KNO₃

Na₂SO₄

NaNO₃

40. Red lead is

Pb₃O₄

PbO₂

PbO

Pb₄O₃

41. 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

42. Sodium metal cannot be stored under

Kerosene oil

Toluene

Benzene

Alcohol

43. Which is the weakest reducing agent?

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

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

Carbon atoms have covalent bonds

Carbon atoms of each plane have sp²

It has delocalized mobile electron

45. The elements which are very abundant I earth are

B and a

Ca and Mg

Si and Al

All

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

Zinc sulphate

Sodium sulphate

Barium sulphate

Potassium sulphate

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

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

Molecular crystals

Molecular addition compounds

Semiconductors

Ionic compounds

49. Anodizing of Al is said when

Aluminum prepared electrolytically

Aluminum coated electrically with aluminum oxide

Aluminum obtained at anode

Aluminum allay containing 95% Al

50. The halide which is not hydrolyzed is

SiF₄

SiCl₄

CCl₄

PbCl₄

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51. AlCl₃ exist as dimmer because

Al has larger radius

Al has greater ionization potential

Incomplete p-subshell

High charge in nucleus

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

Diamond

Sulphur

Graphite

None of these

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

Na₂ CO₃

KNo₃

Li2 CO₃

Caco₃

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

55. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Sodium tetra aluminate

Aluminum oxide

Aluminum hydroxide

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

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

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

As a general drying agent

In drying of ammonia solution

In drying of alcohols

In drying of benzene

59. Which of the following is most dense?

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

Its aqueous sol. Is basic in nature

Its empirical formula is KAl(SO₄). 12H₂O

It is used in dyeing industry

On heating it melts in its water of crystallization

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

Do not show definite trend

Decrease

Increase

Remain constant

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

Zinc oxide

Magnesium oxide

Aluminum oxide

Nitrogen pent oxide

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

It is a noble metal

Oxygen forms a protective reaction easily with water

Fe form mono and divalent ions

Iron undergoes reaction easily with water

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

Magnesium and barium

Magnesium and sodium

Magnesium and copper

Magnesium and potassium

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

66. Which of the following is a Lewis acid?

NCl₃

AsCl₃

PCl₃

AlCl₃

67. Chrome yellow has a formula

PbCrO₄

Pb₃O₄

PbO

PbO₂

68. Potassium is kept in

Ammonia

Kerosene

Alcohol

Water

69. Leblanc process is employed in the manufacture of

Baking soda

Plaster of Paris

Washing soda

Potash

70. The process of aluminum extraction is called

Hall process

Haber process

Termite process

Contact process

71. Plaster of Paris hardens by

Changing into CaCO₃

Combining with water

Giving off CO₂

Giving out water

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

Molten NaCl

Copper

Mercury

Graphite

73. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is not true

It is a conductor of heat

It is a conductor of electricity

74. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and SiO₂

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

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

Water repellent

Lubricants

Antifreeze

Hydraulic brakes

Page 4 of 7

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

Feldspar

Mica

Fluorspar

Cryolite

77. The chief are of aluminum is

Al₂O₃

Al₂O₃. H₂O

Al₂O₃.₂H₂O

Na₃ALF₆

78. Which one is formula of borax?

Na₂B₄O₇. 10H₂O

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

Ca₂B₆O₁₁. 5H₂O

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

f – only

Both d – and f –

s – or – p

d – only

80. BF₃ acts as acid according to the concept of

Bronsted

Lewis

Arrhenius

None

81. 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

82. White lead is

Basic lead carbonate

Basic lead acetate

Basic lead hydroxide

Acidic lead carbonate

83. 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

84. Setting of Plaster of Paris involves

Oxidation with atmospheric oxygen

Hydration to yield another hydrate

Combination with atmospheric CO₂

Dehydration

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

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

Iron

Zinc

Aluminum

Copper

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

Tincal

Calcium carbonate

Colemanite

Boric acid

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

Acetylene

PH₃

SiCl₄

PCl₅

89. A pseudo solid is

CaCO₃

Rock salt

Glass

Diamond

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

To remove air bubbles from molten metal

As insulator

To produce alloy

As nitro meter

91. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

Na₂CO₃. 10H₂O

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

N₂

O₂

CO₂

93. In diaphragm cell, hydrogen is discharged by

HCl

H₂S

Water

NaCl

94. Silicon is found in nature in the form of

Silica or siticates

Oxides

Only silicates

Sulphides

95. Which is the chemical formula of zircon?

H₂Mg₃(SiO₃)₄

Na₃AlF₆

Al₂F₂SiO₄

ZrSiO₄

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

97. Aluminum oxide is

Acidic oxide

Amphoteric oxide

Basic oxide

It does not exists

98. Born is soil has been considered micronutrient for

Alkalinity of soil

All

Proper growth of plants

Soil porosity

99. Causticisation process is used for the preparation of

Caustic soda

Caustic potash

Baryata solution

Slaked lime

100. The aqueous solution of potash alum is

None of these

Basic

Neutral

Acidic

Page 5 of 7

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

O₂

Cl₂

OCl¯

Cl¯

102. Which compound will show the highest lattice energy?

CsF

NaF

RbF

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

Sodium aluminum hydride

Aluminum peroxide

Sodium meta aluminate

Sodium aluminum hydroxide

104. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃

105. Main process for the manufacture of Na₃CO₃ is

Solvay process

Down process

Nelson process

Castner process

106. Alkali earth metals have two electrons outermost

d-orbital

s-orbital

f-orbital

p-orbital

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

Electrolytic process

Baeyer’s process

Hoop’s process

Serpeck’s process

108. Which halide has highest melting point?

Nal

NaF

NaCl

NaBr

109. The formula of Nitre is

Na₂CO₃

KNO₃

NaNO₂

NaCl

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

Atomic volume

Atomic radii

Electropositivity

All above

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

112. Alkali metal hydroxides are stable to heat except

NaOH

RbOH

KOH

LiOH

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

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

Na₂B₄O₇

H₂BO₃

Na₂HBO₃

Na₃BO₃

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

Graphite

Carbrandum

Diamond

Silica

116. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

PbO

Pb₃O₄

Na₂CO₃

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

118. H₃BO₃ is a

Tribasic acid

Monobasic acid

None of these

Dibasic acid

119. Special features of borate glass is that it is

Green in colour

Heat resistant

Used to prepare chemical garden

Low melting

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

CsOH

KOH

LiOH

NaOH

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

Mg(NO₃)₂

All above

Sr(NO₃)₂

Be(NO₃)₂

122. 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

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

NaF

LiF

Csl

CsF

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

They have greater atomic size

They are more reactive

They have smaller size

All

125. What is true about physical state of borax?

White crystalline sublime solid

White amorphous solid

White crystalline solid

None of these

Page 6 of 7

126. Which of the most basic of the following?

As₂O₃

BaO

Na₂O

Al₂O₃

127. Microcosmic salt is

K(NH₄)HPO₃. 2H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

Na(NH₄). H₂O

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

129. The oxides of born and silicon are

Basic

Amphoteric

Natural

Acidic solution

130. The word alkali means

Base salt

Ashes

Spirit

Base

131. Magnesium keeps on burning in

CO₂

N₂O

N₂

N₂ as well as CO₂

132. Portland cement is manufactured by using

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, clay and gypsum

133. Alum is not used

In purification of water

As a mordant is dyeing

In tanning of leather

As an insecticide

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

First transition series

First group

Fifth group

Third group

135. Galena is an ore of

Germanium

Gallium

Tin

Lead

136. Down’s cell is used to prepare

Sodium hydroxide

Sodium metal

Sodium bicarbonate

Sodium carbonate

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

Potassium sulphate

Zinc sulphate

Sodium sulphate

Barium sulphate

138. Cesium oxide will be

Acidic

Very strongly basic

Amphoteric

Weakly basic

139. The element having highest electronegativity among the following is

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

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

IIA

VIII

142. 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

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

SnO

MgO

ZnO

Cr₂O₃

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

None of these

High nuclear charge

High ionization potential

High nuclear charge and ionization

145. Choose the correct statement

Diamond is the hardest and graphite is the softest

Coal is the hardest and coke is the softest

Diamond is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

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

MgCO₃

Al(OH)₃

Al₂O₃

CaCO₃

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

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

Silicon has all sigma bonds

148. Plaster of Paris is a hydrate of

ZnSO₄

MgSO₄

BaSO₄

CaSO₄

149. Which is formula of orthoboric acid?

HBO₂

H₆B₄O₉

H₃BO₃

H₂B₄O₇

150. Bleaching powder is a compound having a formula

CaCO₃

CaOCl₃

CaOCl₂

CaClO

Page 7 of 7

151. What is true about solubility of orthoboric acid?

Readily soluble in cold water

Highly soluble in water at all temperatures.

Sparingly soluble in cold water but readily soluble in hot water

Sparingly soluble in cold water at all temperatures

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

Polonium

Indium

Boron

Aluminum

153. The principle constituent of pyrex glass is

154. Silicon is an important constituent of

Rocks

Haemoglbin

Chlorophyll

Amalgams

155. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₃

Na₃BO₃

NaBO₂

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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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