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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. Alkali metal hydroxides are stable to heat except

KOH

RbOH

LiOH

NaOH

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

High ionization potential

None of these

High nuclear charge and ionization

High nuclear charge

3. Galena is an ore of

Gallium

Lead

Tin

Germanium

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

Magnesium and sodium

Magnesium and copper

Magnesium and potassium

Magnesium and barium

5. Which compound will show the highest lattice energy?

CsF

NaF

RbF

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

1s2 2s2 2p4

1s2 2s2 2p3

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

1s2 2s2 2p6 3s2 3p1

7. The word alkali means

Ashes

Base salt

Base

Spirit

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

As a general drying agent

In drying of alcohols

In drying of ammonia solution

In drying of benzene

9. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is a conductor of electricity

It is not true

It is a conductor of heat

10. Portland cement is manufactured by using

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, clay and gypsum

11. Which is the formula of Chili Salt Peter?

K₂SO₄

Na₂So₄

KNo₃

NaNo₃

12. Borax is a white crystalline solid and it is

Insoluble in water

Soluble only in organic solvents

More soluble in hot water

More soluble in cold water

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

Br₂

CO₂

NO₂

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

Caco₃

Li2 CO₃

KNo₃

Na₂ CO₃

15. 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

Ca(HCO₃)₂

CaO

Ca(OH)₂

16. Sodium conducts electricity because

It has mobile electrons

It has only one electron in the outermost orbit

It is a soft alkali metal

It gives hydrogen with water

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

Na₂B₄O₇.5H₂O

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇

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

Sodium sulphate

Potassium sulphate

Barium sulphate

Zinc sulphate

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

Silica

Diamond

Graphite

Carbrandum

20. 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 iron, aluminum has greater affinity for oxygen

As compared to aluminum, iron has greater affinity for oxygen

21. The process of aluminum extraction is called

Hall process

Haber process

Contact process

Termite process

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

23. Chrome yellow has a formula

Pb₃O₄

PbCrO₄

PbO₂

PbO

24. Born is soil has been considered micronutrient for

Soil porosity

Proper growth of plants

Alkalinity of soil

All

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

Gallainm

Aluminum

Thallium

Polonium

Page 2 of 7

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

Sr(NO₃)₂

Be(NO₃)₂

Mg(NO₃)₂

All above

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

On heating it melts in its water of crystallization

Its empirical formula is KAl(SO₄). 12H₂O

It is used in dyeing industry

Its aqueous sol. Is basic in nature

28. 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)?

The stability of +2 oxidation state increases

Their atomic size decreases

Their metallic character decreases

Their ionization energy increases

29. 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

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

NaCl

CaCl₂

BaCl₂

KCl

31. Which of the most basic of the following?

As₂O₃

Na₂O

BaO

Al₂O₃

32. Aluminum reacts with caustic soda to form

Aluminum hydroxide

Sodium tetra aluminate

Sodium meta-aluminate

Aluminum oxide

33. 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

34. The elements which belong to group IIIA are called

P – block

F – block

D – block

S – block

35. Down’s cell is used to prepare

Sodium carbonate

Sodium hydroxide

Sodium metal

Sodium bicarbonate

36. Chile Salt peter is

Na₂S₂O₃

KNO₃

NaNO₃

Na₂SO₄

37. The formula of china clay is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

38. Which of the following is most dense?

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

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

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Calcium carbonate

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

42. AlCl₃ exist as dimmer because

Al has greater ionization potential

Incomplete p-subshell

High charge in nucleus

Al has larger radius

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

Sodium aluminum hydroxide

Sodium aluminum hydride

Sodium meta aluminate

Aluminum peroxide

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

Do not show definite trend

Decrease

Remain constant

Increase

45. Mica and bauxite are ores of

46. H₃BO₃ is a

Monobasic acid

Dibasic acid

None of these

Tribasic acid

47. 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

48. The principle constituent of pyrex glass is

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

H₂BO₃

Na₂B₄O₇

Na₂HBO₃

Na₃BO₃

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

ZnO

MgO

Cr₂O₃

SnO

Page 3 of 7

51. Which halide has highest melting point?

NaCl

NaBr

NaF

Nal

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

53. White lead is

Basic lead carbonate

Acidic lead carbonate

Basic lead hydroxide

Basic lead acetate

54. A pseudo solid is

Diamond

Rock salt

Glass

CaCO₃

55. Plaster of Paris is a hydrate of

BaSO₄

MgSO₄

ZnSO₄

CaSO₄

56. 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

Fifth group

Third group

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

58. The oxides of beryllium are

None of these

Amphoteric

Acidic

Basic

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

Sulphur

Diamond

Graphite

None of these

60. Silicon is found in nature in the form of

Sulphides

Silica or siticates

Oxides

Only silicates

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

Polonium

Aluminum

Boron

Indium

62. 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

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

Aluminum oxide

Nitrogen pent oxide

Magnesium oxide

Zinc oxide

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

Mica

Cryolite

Fluorspar

Feldspar

65. Which of the following is monovalent?

Metals

Alkaline earth metals

Metalloids

Alkali metals

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

Clay and silica

Lime stone and clay

Lime stone and silica

Lime stone and gypsum

67. Leblanc process is employed in the manufacture of

Washing soda

Plaster of Paris

Potash

Baking soda

68. The order of alkali metals is

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

Fr, Li, Rb, K, Na, Cs

Li, Na, K, Rb, Cs, Fr

69. The element having highest electronegativity among the following is

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

Copper

Graphite

Molten NaCl

Mercury

71. The chief are of aluminum is

Al₂O₃

Na₃ALF₆

Al₂O₃.₂H₂O

Al₂O₃. H₂O

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

Barium sulphate

Zinc sulphate

Potassium sulphate

Sodium sulphate

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

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

75. 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

Page 4 of 7

76. Which is the chemical formula of zircon?

Na₃AlF₆

H₂Mg₃(SiO₃)₄

Al₂F₂SiO₄

ZrSiO₄

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

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

79. Which is the most amphoteric?

CaO

Na₂O

Al₂O₃

MgO

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

Csl

CsF

NaF

LiF

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

Aluminum

Zinc

Copper

Iron

82. Plaster of Paris hardens by

Giving off CO₂

Changing into CaCO₃

Combining with water

Giving out water

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

MgCO₃

Al₂O₃

CaCO₃

Al(OH)₃

84. Setting of cement is an

Endothermic reaction

Exothermic reaction

Neither exothermic nor endothermic

None

85. The chemical composition of white lead is

Na₂CO₃

Pb₃O₄

PbO

Pb(OH)₂.2PbCO₃

86. Cesium oxide will be

Weakly basic

Very strongly basic

Acidic

Amphoteric

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

88. The aqueous solution of potash alum is

Acidic

None of these

Neutral

Basic

89. What is true about physical state of borax?

None of these

White amorphous solid

White crystalline sublime solid

White crystalline solid

90. Microcosmic salt is

HPO₄.4H₂O

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄). H₂O

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

Could not apply

Ca and s

92. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

NaCl

H₂so₄

Water

93. The oxides of born and silicon are

Amphoteric

Natural

Basic

Acidic solution

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

It has delocalized mobile electron

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

95. BF₃ acts as acid according to the concept of

Bronsted

Arrhenius

None

Lewis

96. Main process for the manufacture of Na₃CO₃ is

Down process

Solvay process

Nelson process

Castner process

97. The formula of sodium meta borate is

NaBO₂

Na₂B₄O₇

NaBO₃

Na₃BO₃

98. Choose the correct statement

Diamond is the hardest and graphite is the softest

Diamond is the hardest and coke is the softest

Coal is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

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

OCl¯

O₂

Cl₂

Cl¯

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

Molecular addition compounds

Ionic compounds

Molecular crystals

Semiconductors

Page 5 of 7

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

All

They are more reactive

They have greater atomic size

They have smaller size

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

103. In diaphragm cell, hydrogen is discharged by

HCl

Water

NaCl

H₂S

104. Chile saltpeter has the chemical formula

Na₂B₄O₇

KNO₃

Na₂CO₃. H₂O

NaNO₃

105. The formula of Nitre is

Na₂CO₃

NaCl

NaNO₂

KNO₃

106. Aluminum oxide is

Acidic oxide

Amphoteric oxide

Basic oxide

It does not exists

107. Bleaching powder is a compound having a formula

CaClO

CaOCl₃

CaOCl₂

CaCO₃

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

I₂

NH₄Cl

109. Causticisation process is used for the preparation of

Baryata solution

Caustic potash

Slaked lime

Caustic soda

110. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 7H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 10H₂O

111. Anodizing of Al is said when

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

Aluminum coated electrically with aluminum oxide

Aluminum obtained at anode

112. The formula of calcium cyanamide is

CaCHNH₂

Ca(CN)₂

CaNCN

CaC₂N

113. Silicon is an important constituent of

Chlorophyll

Amalgams

Rocks

Haemoglbin

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

Atomic volume

All above

Electropositivity

Atomic radii

115. Which of the following is a Lewis acid?

AsCl₃

PCl₃

NCl₃

AlCl₃

116. 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

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

IIA

VIII

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

Calcium carbonate

Boric acid

Colemanite

Tincal

119. The elements having highest melting point is

120. Alum is not used

In tanning of leather

As an insecticide

In purification of water

As a mordant is dyeing

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

s – or – p

Both d – and f –

f – only

d – only

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

None

NaNo₃

naHco₃

Na₂co₃

123. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

NaAlSiO₄. 3H₂O

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

124. Which is the weakest reducing agent?

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

Water repellent

Antifreeze

Hydraulic brakes

Lubricants

Page 6 of 7

126. Metallic luster exhibited by Na can be explained by

Excitation of free protons

Oscillation of loose electrons

Existence of body centered cubic lattice

Diffusion of sodium ions

127. Boric acid cannot be used

An antiseptic medicine

In soda bottles

For enamels and glazes

For washing of eyes

128. Which one is formula of borax?

Na₂B₄O₇. 4G₂O

NaOH. B₂O₃

Na₂B₄O₇. 10H₂O

Ca₂B₆O₁₁. 5H₂O

129. Setting of Plaster of Paris involves

Combination with atmospheric CO₂

Hydration to yield another hydrate

Oxidation with atmospheric oxygen

Dehydration

130. Sodium metal cannot be stored under

Toluene

Alcohol

Kerosene oil

Benzene

131. Alkali earth metals have two electrons outermost

s-orbital

d-orbital

f-orbital

p-orbital

132. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

Na₂SiO₃ and SiO₂

Na₂O and SiO₂

133. Which is formula of orthoboric acid?

H₂B₄O₇

H₃BO₃

HBO₂

H₆B₄O₉

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

N₂

O₂

CO₂

135. Potassium is kept in

Kerosene

Ammonia

Water

Alcohol

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

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

O₂

Noble gases

N₂

CO₂

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

LiOH

KOH

NaOH

CsOH

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

Low ionization energy

Low electro negativity

Low density

Low atomic volume

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

Baeyer’s process

Electrolytic process

Hoop’s process

Serpeck’s process

141. Nitrates of which elements give same products

Li, Na, Be

Li, Na, K

Li, Mg, Ca

All have same products

142. Special features of borate glass is that it is

Heat resistant

Low melting

Used to prepare chemical garden

Green in colour

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

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

CO2 is an independent molecule while SiO2 has network covalent structure

144. Red lead is

PbO₂

PbO

Pb₃O₄

Pb₄O₃

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

PCl₅

Acetylene

PH₃

SiCl₄

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

Greater hardness

High melting point

Lower ionization energy

Smaller ionic radii

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

148. Magnesium keeps on burning in

N₂ as well as CO₂

N₂O

N₂

CO₂

149. The halide which is not hydrolyzed is

SiF₄

PbCl₄

SiCl₄

CCl₄

150. 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

Page 7 of 7

151. The chemical formula of bauxite is

None of these

Al₂O₃

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

152. The elements which are very abundant I earth are

Ca and Mg

B and a

All

Si and Al

153. NaNO₃ decomposes on heating at high temperature to give

Na₂O

O₂

N₂

NO₂

154. Dolomite has the composition

CaCl₂.MgCl₂.6H₂O

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

Na₃AIF₆

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

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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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