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ECAT Chemistry S-Block Elements Test Online

Mustansar KhanLast Updated: April 19, 2025

Chemistry S-Block Elements MCQS Online Test

ECAT 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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ECAT Chemistry S-Block Elements Test

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Page 1 of 7

Chemistry

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

2. AlCl₃ exist as dimmer because

High charge in nucleus

Al has larger radius

Al has greater ionization potential

Incomplete p-subshell

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

Magnesium and potassium

Magnesium and barium

Magnesium and sodium

Magnesium and copper

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

5. The halide which is not hydrolyzed is

PbCl₄

SiCl₄

CCl₄

SiF₄

6. The formula of sodium meta borate is

Na₃BO₃

NaBO₃

Na₂B₄O₇

NaBO₂

7. In diaphragm cell, hydrogen is discharged by

HCl

Water

NaCl

H₂S

8. Plaster of Paris hardens by

Changing into CaCO₃

Combining with water

Giving out water

Giving off CO₂

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

O₂

N₂

CO₂

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

11. Down’s cell is used to prepare

Sodium carbonate

Sodium bicarbonate

Sodium hydroxide

Sodium metal

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

H₂BO₃

Na₂HBO₃

Na₃BO₃

Na₂B₄O₇

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

Tincal

Calcium carbonate

Boric acid

Colemanite

14. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

15. Metallic luster exhibited by Na can be explained by

Diffusion of sodium ions

Oscillation of loose electrons

Excitation of free protons

Existence of body centered cubic lattice

16. Sodium reacts with water more vigorously than lithium because

It is more electronegative

It is a metal

It has higher atomic weight

It is more electropositive

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

ZnO

SnO

MgO

Cr₂O₃

18. Main process for the manufacture of Na₃CO₃ is

Solvay process

Castner process

Nelson process

Down process

19. Which halide has highest melting point?

NaF

Nal

NaBr

NaCl

20. Setting of cement is an

Exothermic reaction

Endothermic reaction

None

Neither exothermic nor endothermic

21. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Aluminum oxide

Sodium tetra aluminate

Aluminum hydroxide

22. The formula of calcium cyanamide is

CaC₂N

CaCHNH₂

Ca(CN)₂

CaNCN

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

Al(OH)₃

Al₂O₃

CaCO₃

MgCO₃

24. Nitrates of which elements give same products

Li, Mg, Ca

All have same products

Li, Na, K

Li, Na, Be

25. Born is soil has been considered micronutrient for

All

Alkalinity of soil

Soil porosity

Proper growth of plants

Page 2 of 7

26. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

Na₂SiO₃ and SiO₂

Na₂O and SiO₂

27. BF₃ acts as acid according to the concept of

Lewis

None

Bronsted

Arrhenius

28. The word alkali means

Spirit

Base

Ashes

Base salt

29. Which one is formula of borax?

Ca₂B₆O₁₁. 5H₂O

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

Na₂B₄O₇. 10H₂O

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

High ionization potential

High nuclear charge and ionization

High nuclear charge

None of these

31. The elements which belong to group IIIA are called

D – block

S – block

F – block

P – block

32. Which of the following is monovalent?

Metalloids

Alkaline earth metals

Alkali metals

Metals

33. The elements which are very abundant I earth are

Si and Al

All

B and a

Ca and Mg

34. Causticisation process is used for the preparation of

Caustic potash

Slaked lime

Baryata solution

Caustic soda

35. Alkali earth metals have two electrons outermost

p-orbital

f-orbital

d-orbital

s-orbital

36. Boric acid cannot be used

An antiseptic medicine

In soda bottles

For washing of eyes

For enamels and glazes

37. Silicon is found in nature in the form of

Oxides

Only silicates

Sulphides

Silica or siticates

38. White lead is

Basic lead acetate

Basic lead hydroxide

Basic lead carbonate

Acidic lead carbonate

39. Which of the most basic of the following?

BaO

Al₂O₃

As₂O₃

Na₂O

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

Mercury

Graphite

Copper

Molten NaCl

41. Magnesium keeps on burning in

N₂ as well as CO₂

N₂

N₂O

CO₂

42. Chrome yellow has a formula

Pb₃O₄

PbCrO₄

PbO

PbO₂

43. Microcosmic salt is

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄). H₂O

HPO₄.4H₂O

44. Mica and bauxite are ores of

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

46. 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

47. Silicon is an important constituent of

Haemoglbin

Chlorophyll

Rocks

Amalgams

48. H₃BO₃ is a

Tribasic acid

None of these

Monobasic acid

Dibasic acid

49. Which of the following is most dense?

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

Potassium sulphate

Sodium sulphate

Zinc sulphate

Barium sulphate

Page 3 of 7

51. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, clay and sand

Limestone, gypsum and sand

Limestone, gypsum and alumina

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

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

54. Chile saltpeter has the chemical formula

Na₂CO₃. H₂O

NaNO₃

KNO₃

Na₂B₄O₇

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

Ionic compounds

Molecular crystals

Semiconductors

Molecular addition compounds

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

NH₄Cl

I₂

57. The elements having highest melting point is

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

NO₂

Br₂

CO₂

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

BaCl₂

NaCl

KCl

CaCl₂

60. Aluminum oxide is

Amphoteric oxide

Acidic oxide

It does not exists

Basic oxide

61. A pseudo solid is

CaCO₃

Rock salt

Glass

Diamond

62. The process of aluminum extraction is called

Termite process

Haber process

Contact process

Hall process

63. The principle constituent of pyrex glass is

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

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

As a general drying agent

In drying of benzene

In drying of ammonia solution

In drying of alcohols

66. The element having highest electronegativity among the following is

67. Potassium is kept in

Ammonia

Kerosene

Alcohol

Water

68. The aqueous solution of potash alum is

Basic

None of these

Neutral

Acidic

69. The oxides of born and silicon are

Natural

Acidic solution

Basic

Amphoteric

70. Which of the following is a Lewis acid?

NCl₃

AsCl₃

AlCl₃

PCl₃

71. Borax is a white crystalline solid and it is

More soluble in hot water

Soluble only in organic solvents

Insoluble in water

More soluble in cold water

72. Cesium oxide will be

Amphoteric

Weakly basic

Very strongly basic

Acidic

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

Li2 CO₃

KNo₃

Na₂ CO₃

Caco₃

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

Copper

Iron

Aluminum

Zinc

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

1s2 2s2 2p3

1s2 2s2 2p4

1s2 2s2 2p6 3s2 3p1

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

Page 4 of 7

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

OCl¯

O₂

Cl¯

Cl₂

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

Lime stone and clay

Lime stone and silica

Lime stone and gypsum

Clay and silica

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

CO₂

O₂

Noble gases

N₂

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

Na₂B₄O₇

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

Na₂B₄O₇.5H₂O

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

81. Which is the formula of Chili Salt Peter?

NaNo₃

K₂SO₄

KNo₃

Na₂So₄

82. Sodium metal cannot be stored under

Benzene

Alcohol

Kerosene oil

Toluene

83. 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

84. 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)

85. NaNO₃ decomposes on heating at high temperature to give

Na₂O

N₂

NO₂

O₂

86. Leblanc process is employed in the manufacture of

Washing soda

Potash

Baking soda

Plaster of Paris

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

Be(NO₃)₂

Mg(NO₃)₂

All above

Sr(NO₃)₂

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

Low ionization energy

Low atomic volume

Low density

Low electro negativity

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

Mica

Cryolite

Feldspar

Fluorspar

90. 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(OH)₂

Ca(HCO₃)₂

CaCO₃

CaO

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

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

NaOH

KOH

LiOH

CsOH

93. Choose the correct statement

Coal is the hardest and coke is the softest

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

94. The order of alkali metals is

Na, K, Li, Rb, Fe, Cs

Fr, Li, Rb, K, Na, Cs

Li, Na, Cs, K, Rb, Fr

Li, Na, K, Rb, Cs, Fr

95. 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

Third group

First transition series

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

Hydraulic brakes

Antifreeze

Lubricants

Water repellent

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

They have smaller size

They have greater atomic size

They are more reactive

All

98. Alkali metal hydroxides are stable to heat except

RbOH

LiOH

NaOH

KOH

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

IIA

VIII

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

Potassium sulphate

Barium sulphate

Sodium sulphate

Zinc sulphate

Page 5 of 7

101. 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

102. Red lead is

Pb₃O₄

Pb₄O₃

PbO₂

PbO

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

Hoop’s process

Baeyer’s process

Serpeck’s process

Electrolytic process

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

Could not apply

Ca and s

105. Anodizing of Al is said when

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

Aluminum obtained at anode

106. Which compound will show the highest lattice energy?

RbF

NaF

CsF

107. Aluminum can jam radar due to

It is a conductor of electricity

It is a good reflector of radiant energy

It is a conductor of heat

It is not true

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

Boron

Aluminum

Polonium

Indium

109. The chemical composition of white lead is

PbO

Pb₃O₄

Na₂CO₃

Pb(OH)₂.2PbCO₃

110. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

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

All above

Atomic volume

Electropositivity

Atomic radii

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

113. 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

Carbon atoms have covalent bonds

It has delocalized mobile electron

114. Sodium conducts electricity because

It is a soft alkali metal

It gives hydrogen with water

It has only one electron in the outermost orbit

It has mobile electrons

115. Dolomite has the composition

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

CaCO₃.MgCO₃

KCL.MgCL₂.6H₂O

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

Lower ionization energy

Greater hardness

High melting point

Smaller ionic radii

117. Which is the chemical formula of zircon?

Al₂F₂SiO₄

Na₃AlF₆

H₂Mg₃(SiO₃)₄

ZrSiO₄

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

NaNo₃

None

Na₂co₃

naHco₃

119. 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

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

CO2 is an independent molecule while SiO2 has network covalent structure

CO2 forms multiple bond while silicon does not form multiple bonds

Carbon is non-metal while silicon is semi-metal

Silicon has all sigma bonds

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

As insulator

To remove air bubbles from molten metal

To produce alloy

As nitro meter

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

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

Remain constant

Increase

Do not show definite trend

Decrease

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

Csl

LiF

CsF

NaF

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

SiCl₄

PCl₅

PH₃

Acetylene

Page 6 of 7

126. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

NaKSiO₄. 10H₂O

KH₂Al₃(SiO₄)₃

NaAlSiO₄. 3H₂O

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

Silica

Graphite

Diamond

Carbrandum

128. Chile Salt peter is

NaNO₃

KNO₃

Na₂SO₄

Na₂S₂O₃

129. The chief are of aluminum is

Na₃ALF₆

Al₂O₃. H₂O

Al₂O₃.₂H₂O

Al₂O₃

130. Plaster of Paris is a hydrate of

BaSO₄

CaSO₄

ZnSO₄

MgSO₄

131. What is true about physical state of borax?

White crystalline sublime solid

None of these

White crystalline solid

White amorphous solid

132. 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

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

Aluminum

Gallainm

Thallium

Polonium

134. Which is the weakest reducing agent?

135. Setting of Plaster of Paris involves

Hydration to yield another hydrate

Dehydration

Combination with atmospheric CO₂

Oxidation with atmospheric oxygen

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

Its empirical formula is KAl(SO₄). 12H₂O

It is used in dyeing industry

On heating it melts in its water of crystallization

Its aqueous sol. Is basic in nature

137. Which is the most amphoteric?

MgO

Al₂O₃

CaO

Na₂O

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

Aluminum oxide

Nitrogen pent oxide

Magnesium oxide

Zinc oxide

139. The oxides of beryllium are

None of these

Acidic

Basic

Amphoteric

140. Ammonia may be prepared by heating ammonium chloride with

NaCl

H₂so₄

Aqueous NaoH

Water

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

Calcium oxide

Calcium bicarbonate

Calcium carbonate

Calcium hydroxide

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

Both d – and f –

f – only

s – or – p

d – only

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

144. The chemical formula of bauxite is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃

None of these

145. Bleaching powder is a compound having a formula

CaOCl₃

CaClO

CaOCl₂

CaCO₃

146. Alum is not used

As a mordant is dyeing

In tanning of leather

In purification of water

As an insecticide

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

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

149. Special features of borate glass is that it is

Low melting

Used to prepare chemical garden

Heat resistant

Green in colour

150. What is true about reactivity of aluminum?

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

It reacts readily with oxygen of the air at room temperature

Page 7 of 7

151. Galena is an ore of

Lead

Tin

Germanium

Gallium

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

Sulphur

Graphite

None of these

Diamond

153. Which is formula of orthoboric acid?

H₃BO₃

HBO₂

H₆B₄O₉

H₂B₄O₇

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

Sodium aluminum hydroxide

Aluminum peroxide

Sodium meta aluminate

Sodium aluminum hydride

155. The formula of Nitre is

Na₂CO₃

KNO₃

NaNO₂

NaCl

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Mustansar KhanLast Updated: April 19, 2025

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ECAT Chemistry S-Block Elements Test Online

Chemistry S-Block Elements MCQS Online Test

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ECAT Chemistry S-Block Elements Test

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Chemistry S-Block Elements MCQS Online Test

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