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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 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 atomic size decreases

The stability of +2 oxidation state increases

Their ionization energy increases

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

SnO

ZnO

MgO

Cr₂O₃

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

In drying of benzene

In drying of ammonia solution

As a general drying agent

In drying of alcohols

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

Magnesium and potassium

Magnesium and copper

Magnesium and barium

Magnesium and sodium

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

They are more reactive

They have smaller size

All

They have greater atomic size

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

Sulphur

Diamond

Graphite

None of these

7. Which is formula of orthoboric acid?

H₆B₄O₉

H₃BO₃

H₂B₄O₇

HBO₂

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

Graphite

Copper

Molten NaCl

Mercury

9. The formula of Nitre is

NaNO₂

Na₂CO₃

NaCl

KNO₃

10. Which of the following is monovalent?

Alkali metals

Metals

Alkaline earth metals

Metalloids

11. Which of the following is a Lewis acid?

AsCl₃

PCl₃

AlCl₃

NCl₃

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

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

1s2 2s2 2p3

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p4

13. NaNO₃ decomposes on heating at high temperature to give

NO₂

N₂

O₂

Na₂O

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

Carbon atoms have covalent bonds

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

15. In diaphragm cell, hydrogen is discharged by

H₂S

Water

HCl

NaCl

16. BF₃ acts as acid according to the concept of

Arrhenius

None

Lewis

Bronsted

17. Which of the most basic of the following?

BaO

As₂O₃

Al₂O₃

Na₂O

18. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water at all temperatures

Highly soluble in water at all temperatures.

Sparingly soluble in cold water but readily soluble in hot water

Readily soluble in cold water

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

Carbrandum

Diamond

Silica

Graphite

20. 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

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

Potassium sulphate

Sodium sulphate

Zinc sulphate

Barium sulphate

22. The element having highest electronegativity among the following is

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

Semiconductors

Molecular crystals

Molecular addition compounds

Ionic compounds

24. 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

As compared to iron, aluminum has greater affinity for oxygen

Refraction between aluminum and oxygen is endothermic

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

Page 2 of 7

26. Anodizing of Al is said when

Aluminum allay containing 95% Al

Aluminum coated electrically with aluminum oxide

Aluminum obtained at anode

Aluminum prepared electrolytically

27. Plaster of Paris is a hydrate of

CaSO₄

ZnSO₄

BaSO₄

MgSO₄

28. Chile saltpeter has the chemical formula

NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃. H₂O

29. Dolomite has the composition

KCL.MgCL₂.6H₂O

CaCl₂.MgCl₂.6H₂O

CaCO₃.MgCO₃

Na₃AIF₆

30. 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

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

NaOH

CsOH

KOH

LiOH

32. What is true about physical state of borax?

White crystalline solid

White crystalline sublime solid

White amorphous solid

None of these

33. Setting of Plaster of Paris involves

Oxidation with atmospheric oxygen

Combination with atmospheric CO₂

Dehydration

Hydration to yield another hydrate

34. The elements having highest melting point is

35. Leblanc process is employed in the manufacture of

Baking soda

Potash

Plaster of Paris

Washing soda

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

All above

Atomic radii

Electropositivity

Atomic volume

37. Chile Salt peter is

Na₂SO₄

Na₂S₂O₃

NaNO₃

KNO₃

38. Galena is an ore of

Tin

Lead

Gallium

Germanium

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

BaCl₂

CaCl₂

KCl

NaCl

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

Oxygen forms a protective reaction easily with water

Fe form mono and divalent ions

Iron undergoes reaction easily with water

It is a noble metal

41. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Aluminum hydroxide

Aluminum oxide

Sodium tetra aluminate

42. The principle constituent of pyrex glass is

43. Portland cement is manufactured by using

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and gypsum

Limestone, clay and sand

44. Which is the most amphoteric?

Al₂O₃

Na₂O

CaO

MgO

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

46. Born is soil has been considered micronutrient for

Proper growth of plants

Alkalinity of soil

All

Soil porosity

47. The word alkali means

Base

Base salt

Ashes

Spirit

48. Which is the weakest reducing agent?

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

I₂

NH₄Cl

50. Which of the following is most dense?

Page 3 of 7

51. Sodium conducts electricity because

It has mobile electrons

It gives hydrogen with water

It has only one electron in the outermost orbit

It is a soft alkali metal

52. Cesium oxide will be

Weakly basic

Acidic

Very strongly basic

Amphoteric

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

Polonium

Indium

Boron

Aluminum

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

Calcium hydroxide

Calcium bicarbonate

Calcium oxide

Calcium carbonate

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

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

57. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₃

NaBO₂

Na₃BO₃

58. Setting of cement is an

None

Exothermic reaction

Endothermic reaction

Neither exothermic nor endothermic

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

s – or – p

Both d – and f –

d – only

f – only

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

KNo₃

Li2 CO₃

Na₂ CO₃

Caco₃

61. Sodium metal cannot be stored under

Toluene

Benzene

Alcohol

Kerosene oil

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

Nitrogen pent oxide

Magnesium oxide

Aluminum oxide

Zinc oxide

63. AlCl₃ exist as dimmer because

High charge in nucleus

Al has larger radius

Al has greater ionization potential

Incomplete p-subshell

64. The chemical composition of white lead is

PbO

Pb(OH)₂.2PbCO₃

Pb₃O₄

Na₂CO₃

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

66. Washing soda has formula

Na₂CO₃. 7H₂O

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃.

67. 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

68. Aluminum oxide is

Acidic oxide

It does not exists

Amphoteric oxide

Basic oxide

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

70. Nitrates of which elements give same products

Li, Na, K

All have same products

Li, Mg, Ca

Li, Na, Be

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

MgCO₃

Al₂O₃

Al(OH)₃

CaCO₃

72. The order of alkali metals is

Fr, Li, Rb, K, Na, Cs

Li, Na, Cs, K, Rb, Fr

Li, Na, K, Rb, Cs, Fr

Na, K, Li, Rb, Fe, Cs

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

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

Zinc

Copper

Iron

Aluminum

75. A pseudo solid is

Glass

Rock salt

CaCO₃

Diamond

Page 4 of 7

76. 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

CaCO₃

Ca(HCO₃)₂

CaO

77. Which halide has highest melting point?

NaF

Nal

NaCl

NaBr

78. What is true about reactivity of aluminum?

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

It reacts readily with oxygen of the air at room temperature

None is correct

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

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

Antifreeze

Lubricants

Hydraulic brakes

Water repellent

80. The chief are of aluminum is

Al₂O₃. H₂O

Al₂O₃

Al₂O₃.₂H₂O

Na₃ALF₆

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

Low density

Low electro negativity

Low ionization energy

Low atomic volume

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

Na₃BO₃

Na₂HBO₃

H₂BO₃

Na₂B₄O₇

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

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

N₂

CO₂

Noble gases

O₂

85. Which is the formula of Chili Salt Peter?

KNo₃

NaNo₃

K₂SO₄

Na₂So₄

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

Lime stone and silica

Lime stone and gypsum

Clay and silica

Lime stone and clay

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

Barium sulphate

Potassium sulphate

Zinc sulphate

Sodium sulphate

88. Which is the chemical formula of zircon?

H₂Mg₃(SiO₃)₄

ZrSiO₄

Na₃AlF₆

Al₂F₂SiO₄

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

90. The formula of china clay is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃

Al₂O₃. 2SiO₂. 2H₂O

91. The process of aluminum extraction is called

Contact process

Hall process

Termite process

Haber process

92. Causticisation process is used for the preparation of

Caustic soda

Caustic potash

Slaked lime

Baryata solution

93. 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

94. Down’s cell is used to prepare

Sodium metal

Sodium hydroxide

Sodium bicarbonate

Sodium carbonate

95. Which one is formula of borax?

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 10H₂O

Na₂B₄O₇. 4G₂O

NaOH. B₂O₃

96. H₃BO₃ is a

Tribasic acid

Monobasic acid

None of these

Dibasic acid

97. Magnesium keeps on burning in

CO₂

N₂O

N₂

N₂ as well as CO₂

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

Baeyer’s process

Serpeck’s process

Electrolytic process

Hoop’s process

99. Bleaching powder is a compound having a formula

CaOCl₃

CaOCl₂

CaCO₃

CaClO

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

N₂

CO₂

O₂

Page 5 of 7

101. The halide which is not hydrolyzed is

SiCl₄

PbCl₄

SiF₄

CCl₄

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

Mg(NO₃)₂

Be(NO₃)₂

All above

Sr(NO₃)₂

103. Red lead is

PbO

PbO₂

Pb₄O₃

Pb₃O₄

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

None of these

Irregular tetrahedron

Square pyramid (carbon at apex)

Square planar

105. 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

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

IIA

VIII

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

108. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

NaAlSiO₄. 3H₂O

NaKSiO₄. 10H₂O

109. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

NaCl

Water

H₂so₄

110. Silicon is found in nature in the form of

Sulphides

Silica or siticates

Oxides

Only silicates

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

O₂

Cl₂

Cl¯

OCl¯

112. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and SiO₂

Na₂SiO₃ and CaSiO₃

Na₂O and SiO₂

113. The chemical formula of bauxite is

None of these

Al₂O₃

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

114. Mica and bauxite are ores of

115. Microcosmic salt is

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

HPO₄.4H₂O

Na(NH₄). H₂O

116. Metallic luster exhibited by Na can be explained by

Diffusion of sodium ions

Existence of body centered cubic lattice

Excitation of free protons

Oscillation of loose electrons

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

Polonium

Gallainm

Aluminum

Thallium

118. White lead is

Basic lead acetate

Basic lead hydroxide

Basic lead carbonate

Acidic lead carbonate

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

LiF

CsF

Csl

NaF

120. Which compound will show the highest lattice energy?

RbF

CsF

NaF

121. Boric acid cannot be used

In soda bottles

An antiseptic medicine

For washing of eyes

For enamels and glazes

122. The aqueous solution of potash alum is

Neutral

None of these

Basic

Acidic

123. Alkali earth metals have two electrons outermost

d-orbital

f-orbital

s-orbital

p-orbital

124. Aluminum can jam radar due to

It is a conductor of electricity

It is not true

It is a good reflector of radiant energy

It is a conductor of heat

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

Acetylene

PCl₅

PH₃

SiCl₄

Page 6 of 7

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

Increase

Remain constant

Decrease

Do not show definite trend

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

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

Fluorspar

Cryolite

Feldspar

Mica

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

Silicon has all sigma bonds

Carbon is non-metal while silicon is semi-metal

CO2 is an independent molecule while SiO2 has network covalent structure

CO2 forms multiple bond while silicon does not form multiple bonds

130. The elements which belong to group IIIA are called

F – block

S – block

D – block

P – block

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

None of these

High ionization potential

High nuclear charge and ionization

High nuclear charge

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

To remove air bubbles from molten metal

As insulator

As nitro meter

To produce alloy

133. Chrome yellow has a formula

PbO₂

PbO

Pb₃O₄

PbCrO₄

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

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

Br₂

NO₂

CO₂

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

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

Fifth group

Third group

First group

First transition series

138. The elements which are very abundant I earth are

Si and Al

All

B and a

Ca and Mg

139. 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

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

Its aqueous sol. Is basic in nature

On heating it melts in its water of crystallization

It is used in dyeing industry

Its empirical formula is KAl(SO₄). 12H₂O

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

142. Special features of borate glass is that it is

Low melting

Heat resistant

Used to prepare chemical garden

Green in colour

143. The oxides of beryllium are

None of these

Amphoteric

Acidic

Basic

144. Main process for the manufacture of Na₃CO₃ is

Nelson process

Castner process

Down process

Solvay process

145. Alkali metal hydroxides are stable to heat except

LiOH

KOH

RbOH

NaOH

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

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

147. Plaster of Paris hardens by

Combining with water

Giving out water

Changing into CaCO₃

Giving off CO₂

148. Potassium is kept in

Ammonia

Alcohol

Kerosene

Water

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

Could not apply

Ca and s

150. Alum is not used

As an insecticide

In purification of water

As a mordant is dyeing

In tanning of leather

Page 7 of 7

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

Calcium carbonate

Colemanite

Tincal

Boric acid

152. Silicon is an important constituent of

Amalgams

Chlorophyll

Haemoglbin

Rocks

153. The formula of calcium cyanamide is

CaC₂N

CaCHNH₂

Ca(CN)₂

CaNCN

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

naHco₃

NaNo₃

None

Na₂co₃

155. The oxides of born and silicon are

Basic

Amphoteric

Natural

Acidic solution

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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

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Chemistry S-Block Elements MCQS Online Test

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