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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

Page 1 of 7

Chemistry

1. Metallic luster exhibited by Na can be explained by

Excitation of free protons

Oscillation of loose electrons

Diffusion of sodium ions

Existence of body centered cubic lattice

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

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

Magnesium oxide

Aluminum oxide

Zinc oxide

Nitrogen pent oxide

4. The formula of china clay is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

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

6. 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

7. Causticisation process is used for the preparation of

Caustic potash

Caustic soda

Slaked lime

Baryata solution

8. 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

9. Galena is an ore of

Germanium

Gallium

Tin

Lead

10. 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 alcohols

In drying of ammonia solution

11. The formula of Nitre is

Na₂CO₃

KNO₃

NaNO₂

NaCl

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

13. Which is formula of orthoboric acid?

H₃BO₃

H₆B₄O₉

HBO₂

H₂B₄O₇

14. 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

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

It is used in dyeing industry

Its aqueous sol. Is basic in nature

On heating it melts in its water of crystallization

Its empirical formula is KAl(SO₄). 12H₂O

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

17. The chemical formula of bauxite is

Al₂O₃

Al₂O₃. 2H₂O

None of these

Al₂O₃. SiF₄

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

Polonium

Aluminum

Boron

Indium

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

Electropositivity

Atomic radii

Atomic volume

All above

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

Ca and s

Could not apply

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

Sodium sulphate

Barium sulphate

Zinc sulphate

Potassium sulphate

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

Lime stone and clay

Lime stone and gypsum

Clay and silica

Lime stone and silica

23. Chrome yellow has a formula

PbCrO₄

PbO

PbO₂

Pb₃O₄

24. Which is the chemical formula of zircon?

Al₂F₂SiO₄

H₂Mg₃(SiO₃)₄

ZrSiO₄

Na₃AlF₆

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

CO2 is an independent molecule while SiO2 has network covalent structure

Carbon is non-metal while silicon is semi-metal

CO2 forms multiple bond while silicon does not form multiple bonds

Silicon has all sigma bonds

Page 2 of 7

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

Low ionization energy

Low density

Low electro negativity

Low atomic volume

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

28. Which is the chemical formula of mica?

KH₂Al₃(SiO₄)₃

K2HAL(SiO₄)₃

NaKSiO₄. 10H₂O

NaAlSiO₄. 3H₂O

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

30. Leblanc process is employed in the manufacture of

Plaster of Paris

Washing soda

Potash

Baking soda

31. The formula of calcium cyanamide is

CaCHNH₂

CaNCN

CaC₂N

Ca(CN)₂

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

33. Sodium metal cannot be stored under

Alcohol

Kerosene oil

Toluene

Benzene

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

Baeyer’s process

Electrolytic process

Hoop’s process

Serpeck’s process

35. Which one is formula of borax?

Na₂B₄O₇. 10H₂O

Ca₂B₆O₁₁. 5H₂O

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

36. NaNO₃ decomposes on heating at high temperature to give

NO₂

O₂

Na₂O

N₂

37. Dolomite has the composition

CaCO₃.MgCO₃

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

KCL.MgCL₂.6H₂O

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

Calcium hydroxide

Calcium bicarbonate

Calcium carbonate

Calcium oxide

39. The aqueous solution of potash alum is

Neutral

Basic

None of these

Acidic

40. The halide which is not hydrolyzed is

CCl₄

SiF₄

PbCl₄

SiCl₄

41. The elements having highest melting point is

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

As nitro meter

To produce alloy

To remove air bubbles from molten metal

As insulator

43. Which is the most amphoteric?

Al₂O₃

MgO

CaO

Na₂O

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

NaNo₃

naHco₃

None

Na₂co₃

45. 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

46. The elements which are very abundant I earth are

B and a

Si and Al

Ca and Mg

All

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

Mercury

Graphite

Copper

Molten NaCl

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

Carbrandum

Graphite

Diamond

Silica

49. The elements which belong to group IIIA are called

S – block

P – block

D – block

F – block

50. Red lead is

Pb₃O₄

PbO₂

Pb₄O₃

PbO

Page 3 of 7

51. Boric acid cannot be used

In soda bottles

An antiseptic medicine

For washing of eyes

For enamels and glazes

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

Li2 CO₃

Na₂ CO₃

KNo₃

Caco₃

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

Barium sulphate

Sodium sulphate

Potassium sulphate

Zinc sulphate

54. Which is the formula of Chili Salt Peter?

KNo₃

NaNo₃

Na₂So₄

K₂SO₄

55. The oxides of born and silicon are

Natural

Amphoteric

Acidic solution

Basic

56. 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

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

N₂

CO₂

O₂

58. The process of aluminum extraction is called

Contact process

Hall process

Haber process

Termite process

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

Acetylene

SiCl₄

PH₃

PCl₅

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

d – only

f – only

Both d – and f –

s – or – p

61. AlCl₃ exist as dimmer because

Al has greater ionization potential

Al has larger radius

High charge in nucleus

Incomplete p-subshell

62. Anodizing of Al is said when

Aluminum obtained at anode

Aluminum prepared electrolytically

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

63. Borax is a white crystalline solid and it is

Soluble only in organic solvents

Insoluble in water

More soluble in cold water

More soluble in hot water

64. The chief are of aluminum is

Al₂O₃

Al₂O₃.₂H₂O

Al₂O₃. H₂O

Na₃ALF₆

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

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

66. Microcosmic salt is

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

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

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

Lubricants

Water repellent

Antifreeze

Hydraulic brakes

69. Which of the following is most dense?

70. H₃BO₃ is a

Dibasic acid

Tribasic acid

None of these

Monobasic acid

71. A pseudo solid is

Glass

Rock salt

Diamond

CaCO₃

72. White lead is

Basic lead carbonate

Acidic lead carbonate

Basic lead hydroxide

Basic lead acetate

73. 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

74. Aluminum reacts with caustic soda to form

Aluminum oxide

Sodium meta-aluminate

Aluminum hydroxide

Sodium tetra aluminate

75. Silicon is found in nature in the form of

Only silicates

Silica or siticates

Sulphides

Oxides

Page 4 of 7

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

Sodium aluminum hydroxide

Sodium meta aluminate

Aluminum peroxide

Sodium aluminum hydride

77. Down’s cell is used to prepare

Sodium bicarbonate

Sodium carbonate

Sodium hydroxide

Sodium metal

78. Setting of cement is an

None

Endothermic reaction

Neither exothermic nor endothermic

Exothermic reaction

79. Alkali earth metals have two electrons outermost

f-orbital

s-orbital

d-orbital

p-orbital

80. Alum is not used

As an insecticide

In purification of water

As a mordant is dyeing

In tanning of leather

81. Which of the following is a Lewis acid?

AsCl₃

AlCl₃

NCl₃

PCl₃

82. 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

CaCO₃

CaO

Ca(OH)₂

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

OCl¯

Cl¯

O₂

Cl₂

84. Plaster of Paris is a hydrate of

CaSO₄

MgSO₄

BaSO₄

ZnSO₄

85. Which is the weakest reducing agent?

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

BaCl₂

KCl

CaCl₂

NaCl

87. The principle constituent of pyrex glass is

88. Ammonia may be prepared by heating ammonium chloride with

H₂so₄

NaCl

Water

Aqueous NaoH

89. 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

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

As compared to aluminum, iron has greater affinity for oxygen

As compared to iron, aluminum has greater affinity for oxygen

Reaction between iron and oxygen is endothermic

Refraction between aluminum and oxygen is endothermic

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

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

None of these

Square planar

Square pyramid (carbon at apex)

Irregular tetrahedron

93. Sodium reacts with water more vigorously than lithium because

It has higher atomic weight

It is more electronegative

It is a metal

It is more electropositive

94. Special features of borate glass is that it is

Low melting

Heat resistant

Used to prepare chemical garden

Green in colour

95. Main process for the manufacture of Na₃CO₃ is

Down process

Castner process

Nelson process

Solvay process

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

VIII

IIA

97. Plaster of Paris hardens by

Giving off CO₂

Giving out water

Changing into CaCO₃

Combining with water

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

LiF

CsF

NaF

Csl

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

CO₂

NO₂

Br₂

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

Polonium

Gallainm

Aluminum

Thallium

Page 5 of 7

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

Na₂HBO₃

H₂BO₃

Na₂B₄O₇

Na₃BO₃

102. Chile Salt peter is

Na₂SO₄

NaNO₃

KNO₃

Na₂S₂O₃

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

Diamond

Sulphur

None of these

Graphite

104. Bleaching powder is a compound having a formula

CaOCl₃

CaClO

CaCO₃

CaOCl₂

105. What is true about physical state of borax?

White crystalline sublime solid

None of these

White crystalline solid

White amorphous solid

106. 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

The stability of +2 oxidation state increases

Their atomic size decreases

107. BF₃ acts as acid according to the concept of

Arrhenius

Bronsted

None

Lewis

108. Magnesium keeps on burning in

N₂O

N₂ as well as CO₂

CO₂

N₂

109. 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

Third group

Fifth group

110. Which halide has highest melting point?

NaCl

NaF

Nal

NaBr

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

Al(OH)₃

CaCO₃

MgCO₃

Al₂O₃

112. Cesium oxide will be

Very strongly basic

Weakly basic

Amphoteric

Acidic

113. Chile saltpeter has the chemical formula

Na₂B₄O₇

NaNO₃

KNO₃

Na₂CO₃. H₂O

114. 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

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

Increase

Decrease

Do not show definite trend

Remain constant

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

Calcium carbonate

Boric acid

Tincal

Colemanite

117. In diaphragm cell, hydrogen is discharged by

HCl

Water

NaCl

H₂S

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

CsOH

KOH

LiOH

NaOH

119. Mica and bauxite are ores of

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

I₂

NH₄Cl

121. Born is soil has been considered micronutrient for

All

Proper growth of plants

Alkalinity of soil

Soil porosity

122. Which of the following is monovalent?

Metalloids

Alkaline earth metals

Alkali metals

Metals

123. What is true about reactivity of aluminum?

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

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

None is correct

It reacts readily with oxygen of the air at room temperature

124. What is true about solubility of orthoboric acid?

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

Readily soluble in cold water

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

Page 6 of 7

126. Silicon is an important constituent of

Rocks

Chlorophyll

Haemoglbin

Amalgams

127. Portland cement is manufactured by using

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, gypsum and alumina

Limestone, clay and gypsum

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

Cryolite

Feldspar

Mica

Fluorspar

129. Aluminum oxide is

Acidic oxide

It does not exists

Basic oxide

Amphoteric oxide

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

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

Semiconductors

Ionic compounds

Molecular addition compounds

Molecular crystals

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

Magnesium and potassium

Magnesium and barium

Magnesium and sodium

Magnesium and copper

133. The oxides of beryllium are

Acidic

None of these

Basic

Amphoteric

134. The word alkali means

Base

Base salt

Ashes

Spirit

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

MgO

Cr₂O₃

SnO

ZnO

136. Potassium is kept in

Alcohol

Water

Ammonia

Kerosene

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

138. Which of the most basic of the following?

BaO

As₂O₃

Al₂O₃

Na₂O

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

140. Which compound will show the highest lattice energy?

RbF

CsF

NaF

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

CO₂

N₂

Noble gases

O₂

142. The chemical composition of white lead is

Pb₃O₄

Pb(OH)₂.2PbCO₃

Na₂CO₃

PbO

143. Ordinary window glass is a mixture of

Na₂SiO₃ and SiO₂

Na₂SiO₃ and CaSiO₃

Na₂O and SiO₂

Na₂CiO₃ and CO₂

144. Alkali metal hydroxides are stable to heat except

RbOH

NaOH

KOH

LiOH

145. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₃

Na₃BO₃

NaBO₂

146. 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

It has delocalized mobile electron

Carbon atoms of each plane have sp²

Carbon atoms have covalent bonds

147. Nitrates of which elements give same products

Li, Na, Be

Li, Na, K

All have same products

Li, Mg, Ca

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

Iron

Copper

Zinc

Aluminum

149. Setting of Plaster of Paris involves

Hydration to yield another hydrate

Dehydration

Combination with atmospheric CO₂

Oxidation with atmospheric oxygen

150. Washing soda has formula

Na₂CO₃. 7H₂O

Na₂CO₃. 3H₂O

Na₂CO₃.

Na₂CO₃. 10H₂O

Page 7 of 7

151. The order of alkali metals is

Li, Na, K, Rb, Cs, Fr

Li, Na, Cs, K, Rb, Fr

Na, K, Li, Rb, Fe, Cs

Fr, Li, Rb, K, Na, Cs

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

153. The element having highest electronegativity among the following is

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

All above

Sr(NO₃)₂

Be(NO₃)₂

Mg(NO₃)₂

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

Fe form mono and divalent ions

Oxygen forms a protective reaction easily with water

It is a noble metal

Iron undergoes reaction easily with water

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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

ECAT Chemistry S-Block Elements Chapter Online Test

ECAT Chemistry S-Block Elements Test

Chemistry

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Chemistry S-Block Elements MCQS Online Test

ECAT Chemistry S-Block Elements Chapter Online Test

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