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 compound will show the highest lattice energy?

RbF

CsF

NaF

2. 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(OH)₂

Ca(HCO₃)₂

CaCO₃

3. Which halide has highest melting point?

Nal

NaCl

NaBr

NaF

4. Which is formula of orthoboric acid?

H₃BO₃

H₂B₄O₇

HBO₂

H₆B₄O₉

5. Borax is a white crystalline solid and it is

More soluble in hot water

More soluble in cold water

Insoluble in water

Soluble only in organic solvents

6. Metallic luster exhibited by Na can be explained by

Excitation of free protons

Existence of body centered cubic lattice

Diffusion of sodium ions

Oscillation of loose electrons

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

8. Which is the formula of Chili Salt Peter?

Na₂So₄

KNo₃

K₂SO₄

NaNo₃

9. Born is soil has been considered micronutrient for

Alkalinity of soil

All

Proper growth of plants

Soil porosity

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

11. Silicon is an important constituent of

Amalgams

Haemoglbin

Rocks

Chlorophyll

12. The principle constituent of pyrex glass is

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

In drying of ammonia solution

As a general drying agent

In drying of benzene

In drying of alcohols

14. The formula of Nitre is

Na₂CO₃

KNO₃

NaCl

NaNO₂

15. The elements which belong to group IIIA are called

D – block

P – block

S – block

F – block

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

CaCl₂

BaCl₂

KCl

NaCl

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

NaF

Csl

CsF

LiF

18. 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

19. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

H₂so₄

NaCl

Water

20. Anodizing of Al is said when

Aluminum obtained at anode

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

21. The chemical formula of bauxite is

Al₂O₃

None of these

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

22. 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

23. 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

Fe form mono and divalent ions

Iron undergoes reaction easily with water

24. Which of the following is monovalent?

Metals

Metalloids

Alkaline earth metals

Alkali metals

25. Main process for the manufacture of Na₃CO₃ is

Nelson process

Castner process

Solvay process

Down process

Page 2 of 7

26. Plaster of Paris is a hydrate of

CaSO₄

BaSO₄

ZnSO₄

MgSO₄

27. 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

28. Nitrates of which elements give same products

Li, Na, Be

Li, Mg, Ca

Li, Na, K

All have same products

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

Aluminum

Boron

Polonium

Indium

30. Which of the following is most dense?

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

Ca and s

Could not apply

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

f – only

d – only

s – or – p

Both d – and f –

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

Magnesium and potassium

Magnesium and sodium

Magnesium and barium

Magnesium and copper

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

Colemanite

Calcium carbonate

Tincal

Boric acid

35. Which is the weakest reducing agent?

36. Leblanc process is employed in the manufacture of

Plaster of Paris

Baking soda

Washing soda

Potash

37. Boric acid cannot be used

An antiseptic medicine

In soda bottles

For washing of eyes

For enamels and glazes

38. A pseudo solid is

Rock salt

Glass

CaCO₃

Diamond

39. The word alkali means

Base salt

Ashes

Spirit

Base

40. Sodium metal cannot be stored under

Kerosene oil

Alcohol

Toluene

Benzene

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

Low atomic volume

Low density

Low ionization energy

Low electro negativity

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

CO2 forms multiple bond while silicon does not form multiple bonds

Carbon is non-metal while silicon is semi-metal

CO2 is an independent molecule while SiO2 has network covalent structure

Silicon has all sigma bonds

43. The elements which are very abundant I earth are

B and a

Si and Al

Ca and Mg

All

44. 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

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

Sulphur

None of these

Graphite

Diamond

46. Galena is an ore of

Germanium

Tin

Lead

Gallium

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

Electropositivity

Atomic radii

Atomic volume

All above

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

CaCO₃

Al₂O₃

MgCO₃

Al(OH)₃

49. Cesium oxide will be

Amphoteric

Very strongly basic

Weakly basic

Acidic

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

PCl₅

SiCl₄

Acetylene

PH₃

Page 3 of 7

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

All

They have greater atomic size

They have smaller size

They are more reactive

52. NaNO₃ decomposes on heating at high temperature to give

Na₂O

N₂

NO₂

O₂

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

Silica

Graphite

Diamond

Carbrandum

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

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

VIII

IIA

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

All above

Mg(NO₃)₂

Be(NO₃)₂

Sr(NO₃)₂

57. In diaphragm cell, hydrogen is discharged by

Water

NaCl

H₂S

HCl

58. Chile saltpeter has the chemical formula

KNO₃

NaNO₃

Na₂B₄O₇

Na₂CO₃. H₂O

59. Magnesium keeps on burning in

N₂ as well as CO₂

N₂O

CO₂

N₂

60. Aluminum can jam radar due to

It is a conductor of electricity

It is a conductor of heat

It is not true

It is a good reflector of radiant energy

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

Cryolite

Mica

Feldspar

Fluorspar

62. Plaster of Paris hardens by

Changing into CaCO₃

Giving off CO₂

Giving out water

Combining with water

63. The oxides of born and silicon are

Natural

Amphoteric

Acidic solution

Basic

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

Reaction between iron and oxygen is endothermic

As compared to aluminum, iron has greater affinity for oxygen

Refraction between aluminum and oxygen is endothermic

As compared to iron, aluminum has greater affinity for oxygen

65. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water but readily soluble in hot water

Readily soluble in cold water

Highly soluble in water at all temperatures.

Sparingly soluble in cold water at all temperatures

66. Alkali earth metals have two electrons outermost

s-orbital

d-orbital

f-orbital

p-orbital

67. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, gypsum and alumina

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

Baeyer’s process

Hoop’s process

Electrolytic process

Serpeck’s process

69. Washing soda has formula

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

Na₂CO₃.

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

Br₂

NO₂

CO₂

71. Which is the chemical formula of mica?

NaKSiO₄. 10H₂O

K2HAL(SiO₄)₃

NaAlSiO₄. 3H₂O

KH₂Al₃(SiO₄)₃

72. 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

73. The oxides of beryllium are

Acidic

Amphoteric

None of these

Basic

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

Lime stone and silica

Lime stone and clay

Lime stone and gypsum

Clay and silica

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

Cr₂O₃

SnO

ZnO

MgO

Page 4 of 7

76. BF₃ acts as acid according to the concept of

Bronsted

None

Arrhenius

Lewis

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

Calcium hydroxide

Calcium bicarbonate

Calcium oxide

Calcium carbonate

78. The halide which is not hydrolyzed is

SiCl₄

CCl₄

PbCl₄

SiF₄

79. Microcosmic salt is

HPO₄.4H₂O

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

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

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

82. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₂

Na₃BO₃

NaBO₃

83. The chief are of aluminum is

Al₂O₃. H₂O

Na₃ALF₆

Al₂O₃.₂H₂O

Al₂O₃

84. The elements having highest melting point is

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

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

Barium sulphate

Zinc sulphate

Sodium sulphate

Potassium sulphate

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

Decrease

Do not show definite trend

Remain constant

Increase

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

1s2 2s2 2p3

1s2 2s2 2p6 3s2 3p1

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

1s2 2s2 2p4

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

O₂

Noble gases

CO₂

N₂

90. Silicon is found in nature in the form of

Oxides

Only silicates

Silica or siticates

Sulphides

91. H₃BO₃ is a

Monobasic acid

Dibasic acid

None of these

Tribasic acid

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

Gallainm

Polonium

Aluminum

Thallium

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

94. Special features of borate glass is that it is

Low melting

Used to prepare chemical garden

Green in colour

Heat resistant

95. Down’s cell is used to prepare

Sodium carbonate

Sodium bicarbonate

Sodium hydroxide

Sodium metal

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

97. Sodium reacts with water more vigorously than lithium because

It is a metal

It is more electronegative

It has higher atomic weight

It is more electropositive

98. 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 ionization energy increases

Their atomic size decreases

The stability of +2 oxidation state increases

99. What is true about physical state of borax?

White crystalline sublime solid

White crystalline solid

White amorphous solid

None of these

100. Alkali metal hydroxides are stable to heat except

RbOH

KOH

NaOH

LiOH

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. Bleaching powder is a compound having a formula

CaCO₃

CaOCl₃

CaClO

CaOCl₂

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

Sodium meta aluminate

Sodium aluminum hydride

Aluminum peroxide

Sodium aluminum hydroxide

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

NaOH

LiOH

KOH

CsOH

105. Potassium is kept in

Water

Ammonia

Alcohol

Kerosene

106. Setting of Plaster of Paris involves

Oxidation with atmospheric oxygen

Dehydration

Combination with atmospheric CO₂

Hydration to yield another hydrate

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

Molecular crystals

Ionic compounds

Molecular addition compounds

Semiconductors

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

OCl¯

O₂

Cl₂

Cl¯

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

First group

First transition series

Third group

Fifth group

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

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

Aluminum

Zinc

Iron

Copper

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

H₂BO₃

Na₃BO₃

Na₂B₄O₇

Na₂HBO₃

113. Choose the correct statement

Coal is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

Diamond is the hardest and coke is the softest

Diamond is the hardest and graphite is the softest

114. The formula of calcium cyanamide is

CaC₂N

CaNCN

CaCHNH₂

Ca(CN)₂

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

I₂

NH₄Cl

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

Li2 CO₃

Caco₃

KNo₃

Na₂ CO₃

117. The order of alkali metals is

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

Li, Na, K, Rb, Cs, Fr

Fr, Li, Rb, K, Na, Cs

118. Chile Salt peter is

Na₂S₂O₃

KNO₃

Na₂SO₄

NaNO₃

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

120. Ordinary window glass is a mixture of

Na₂SiO₃ and SiO₂

Na₂O and SiO₂

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

121. Mica and bauxite are ores of

122. White lead is

Basic lead hydroxide

Basic lead acetate

Basic lead carbonate

Acidic lead carbonate

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

Copper

Mercury

Molten NaCl

Graphite

124. The element having highest electronegativity among the following is

125. Which of the most basic of the following?

As₂O₃

Al₂O₃

Na₂O

BaO

Page 6 of 7

126. Sodium conducts electricity because

It is a soft alkali metal

It has only one electron in the outermost orbit

It has mobile electrons

It gives hydrogen with water

127. Chrome yellow has a formula

PbO

Pb₃O₄

PbCrO₄

PbO₂

128. Aluminum oxide is

Amphoteric oxide

Acidic oxide

Basic oxide

It does not exists

129. Causticisation process is used for the preparation of

Baryata solution

Slaked lime

Caustic potash

Caustic soda

130. Red lead is

PbO

PbO₂

Pb₄O₃

Pb₃O₄

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

132. Alum is not used

As a mordant is dyeing

As an insecticide

In purification of water

In tanning of leather

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

High melting point

Lower ionization energy

Smaller ionic radii

Greater hardness

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

Na₂B₄O₇.5H₂O

Na₂B₄O₇

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

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

Zinc oxide

Magnesium oxide

Aluminum oxide

Nitrogen pent oxide

136. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Aluminum hydroxide

Sodium tetra aluminate

Aluminum oxide

137. Which is the chemical formula of zircon?

H₂Mg₃(SiO₃)₄

ZrSiO₄

Na₃AlF₆

Al₂F₂SiO₄

138. The chemical composition of white lead is

Na₂CO₃

Pb₃O₄

Pb(OH)₂.2PbCO₃

PbO

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

Barium sulphate

Sodium sulphate

Zinc sulphate

Potassium sulphate

140. The formula of china clay is

Al₂O₃. SiF₄

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

Al₂O₃. 2H₂O

141. AlCl₃ exist as dimmer because

Al has greater ionization potential

Incomplete p-subshell

High charge in nucleus

Al has larger radius

142. Setting of cement is an

Neither exothermic nor endothermic

None

Exothermic reaction

Endothermic reaction

143. Which of the following is a Lewis acid?

NCl₃

AsCl₃

PCl₃

AlCl₃

144. The process of aluminum extraction is called

Hall process

Termite process

Contact process

Haber process

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

Irregular tetrahedron

None of these

Square pyramid (carbon at apex)

Square planar

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

Hydraulic brakes

Antifreeze

Water repellent

Lubricants

147. Which is the most amphoteric?

MgO

CaO

Al₂O₃

Na₂O

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

High nuclear charge and ionization

None of these

High nuclear charge

High ionization potential

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

N₂

O₂

CO₂

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

Na₂co₃

NaNo₃

naHco₃

None

Page 7 of 7

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

152. Dolomite has the composition

CaCl₂.MgCl₂.6H₂O

Na₃AIF₆

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

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

154. The aqueous solution of potash alum is

Acidic

Neutral

None of these

Basic

155. Which one is formula of borax?

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 10H₂O

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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

Important Chemistry S-Block Elements Question and Answer

Chemistry S-Block Elements Practice Test Online With Explanation

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