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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. The principle constituent of pyrex glass is

2. Alkali metal hydroxides are stable to heat except

LiOH

RbOH

NaOH

KOH

3. BF₃ acts as acid according to the concept of

Arrhenius

Lewis

None

Bronsted

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

NaCl

KCl

BaCl₂

CaCl₂

5. Which of the following is monovalent?

Alkaline earth metals

Alkali metals

Metals

Metalloids

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

SnO

Cr₂O₃

MgO

ZnO

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

Ca and s

Could not apply

8. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water at all temperatures

Highly soluble in water at all temperatures.

Readily soluble in cold water

Sparingly soluble in cold water but readily soluble in hot water

9. Alkali earth metals have two electrons outermost

d-orbital

f-orbital

p-orbital

s-orbital

10. NaNO₃ decomposes on heating at high temperature to give

N₂

O₂

Na₂O

NO₂

11. Aluminum oxide is

Amphoteric oxide

Acidic oxide

It does not exists

Basic oxide

12. Cesium oxide will be

Acidic

Weakly basic

Amphoteric

Very strongly basic

13. The halide which is not hydrolyzed is

PbCl₄

SiF₄

CCl₄

SiCl₄

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

NH₄Cl

I₂

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. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, gypsum and alumina

Limestone, clay and sand

Limestone, gypsum and sand

17. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃

18. 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

19. Plaster of Paris is a hydrate of

ZnSO₄

CaSO₄

BaSO₄

MgSO₄

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

21. Microcosmic salt is

HPO₄.4H₂O

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

22. The elements which belong to group IIIA are called

P – block

D – block

S – block

F – block

23. The element having highest electronegativity among the following is

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

Cl¯

Cl₂

OCl¯

O₂

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

Calcium oxide

Calcium bicarbonate

Calcium carbonate

Calcium hydroxide

Page 2 of 7

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

NaNo₃

Na₂co₃

naHco₃

None

27. Chrome yellow has a formula

PbO₂

PbO

Pb₃O₄

PbCrO₄

28. The chief are of aluminum is

Al₂O₃

Al₂O₃.₂H₂O

Na₃ALF₆

Al₂O₃. H₂O

29. Causticisation process is used for the preparation of

Caustic soda

Slaked lime

Baryata solution

Caustic potash

30. Galena is an ore of

Lead

Tin

Gallium

Germanium

31. Which is the chemical formula of zircon?

Al₂F₂SiO₄

Na₃AlF₆

H₂Mg₃(SiO₃)₄

ZrSiO₄

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

Na₂B₄O₇. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₃O₆. 10H₂O

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

34. Which one is formula of borax?

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

Na₂B₄O₇. 10H₂O

Ca₂B₆O₁₁. 5H₂O

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

Aluminum

Copper

Zinc

Iron

36. Anodizing of Al is said when

Aluminum obtained at anode

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

37. Silicon is an important constituent of

Haemoglbin

Chlorophyll

Amalgams

Rocks

38. Dolomite has the composition

KCL.MgCL₂.6H₂O

Na₃AIF₆

CaCO₃.MgCO₃

CaCl₂.MgCl₂.6H₂O

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

Low atomic volume

Low density

Low ionization energy

Low electro negativity

40. Which of the following is a Lewis acid?

NCl₃

PCl₃

AsCl₃

AlCl₃

41. Which of the following is most dense?

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

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

Acetylene

PH₃

PCl₅

SiCl₄

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

High melting point

Smaller ionic radii

Lower ionization energy

Greater hardness

45. Which compound will show the highest lattice energy?

NaF

CsF

RbF

46. Down’s cell is used to prepare

Sodium carbonate

Sodium bicarbonate

Sodium hydroxide

Sodium metal

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

Lime stone and silica

Lime stone and clay

Clay and silica

Lime stone and gypsum

48. Born is soil has been considered micronutrient for

Proper growth of plants

All

Soil porosity

Alkalinity of soil

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

50. Ordinary window glass is a mixture of

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

Na₂CiO₃ and CO₂

Na₂SiO₃ and SiO₂

Page 3 of 7

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

52. What is true about physical state of borax?

None of these

White crystalline solid

White crystalline sublime solid

White amorphous solid

53. Special features of borate glass is that it is

Used to prepare chemical garden

Heat resistant

Low melting

Green in colour

54. 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

55. Ammonia may be prepared by heating ammonium chloride with

H₂so₄

NaCl

Water

Aqueous NaoH

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

Magnesium oxide

Aluminum oxide

Nitrogen pent oxide

Zinc oxide

57. Potassium is kept in

Kerosene

Water

Alcohol

Ammonia

58. The elements which are very abundant I earth are

Si and Al

All

B and a

Ca and Mg

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

CsF

NaF

Csl

LiF

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

Third group

Fifth group

First group

First transition series

61. The aqueous solution of potash alum is

None of these

Acidic

Basic

Neutral

62. The chemical formula of bauxite is

None of these

Al₂O₃

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

63. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

NaAlSiO₄. 3H₂O

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

Magnesium and copper

Magnesium and sodium

Magnesium and potassium

Magnesium and barium

65. AlCl₃ exist as dimmer because

High charge in nucleus

Incomplete p-subshell

Al has larger radius

Al has greater ionization potential

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

O₂

N₂

CO₂

Noble gases

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

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

Increase

Decrease

Remain constant

Do not show definite trend

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

Cryolite

Mica

Feldspar

Fluorspar

70. Choose the correct statement

Diamond is the hardest and graphite is the softest

Graphite is the hardest which lamp black is the softest

Diamond is the hardest and coke is the softest

Coal is the hardest and coke is the softest

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

72. 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

73. White lead is

Acidic lead carbonate

Basic lead carbonate

Basic lead acetate

Basic lead hydroxide

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

Al(OH)₃

MgCO₃

Al₂O₃

CaCO₃

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

Antifreeze

Hydraulic brakes

Lubricants

Water repellent

Page 4 of 7

76. Which is the most amphoteric?

CaO

Al₂O₃

Na₂O

MgO

77. Sodium reacts with water more vigorously than lithium because

It is a metal

It has higher atomic weight

It is more electropositive

It is more electronegative

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

Zinc sulphate

Sodium sulphate

Potassium sulphate

Barium sulphate

79. 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

Iron undergoes reaction easily with water

Fe form mono and divalent ions

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

NO₂

CO₂

Br₂

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

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

It is used in dyeing industry

Its empirical formula is KAl(SO₄). 12H₂O

On heating it melts in its water of crystallization

Its aqueous sol. Is basic in nature

83. 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

Reaction between iron and oxygen is endothermic

Refraction between aluminum and oxygen is endothermic

As compared to iron, aluminum has greater affinity for oxygen

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

As nitro meter

To remove air bubbles from molten metal

As insulator

To produce alloy

85. A pseudo solid is

Diamond

Glass

Rock salt

CaCO₃

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

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

Na₂HBO₃

Na₂B₄O₇

H₂BO₃

Na₃BO₃

88. Nitrates of which elements give same products

All have same products

Li, Mg, Ca

Li, Na, Be

Li, Na, K

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

Graphite

Sulphur

None of these

Diamond

90. 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 ionization energy increases

Their metallic character decreases

91. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

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

CO₂

O₂

N₂

93. Red lead is

PbO₂

Pb₄O₃

PbO

Pb₃O₄

94. 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

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

IIA

VIII

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

Graphite

Mercury

Molten NaCl

Copper

97. Main process for the manufacture of Na₃CO₃ is

Solvay process

Castner process

Down process

Nelson process

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

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

Silicon has all sigma bonds

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

Hoop’s process

Electrolytic process

Baeyer’s process

Serpeck’s process

100. The order of alkali metals is

Li, Na, K, Rb, Cs, Fr

Na, K, Li, Rb, Fe, Cs

Fr, Li, Rb, K, Na, Cs

Li, Na, Cs, K, Rb, Fr

Page 5 of 7

101. Alum is not used

As an insecticide

In tanning of leather

In purification of water

As a mordant is dyeing

102. Boric acid cannot be used

In soda bottles

An antiseptic medicine

For enamels and glazes

For washing of eyes

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

Atomic radii

All above

Electropositivity

Atomic volume

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

105. Chile Salt peter is

Na₂SO₄

NaNO₃

Na₂S₂O₃

KNO₃

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

d – only

s – or – p

f – only

Both d – and f –

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

Square planar

Square pyramid (carbon at apex)

Irregular tetrahedron

None of these

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

CsOH

NaOH

KOH

LiOH

109. What is true about reactivity of aluminum?

None is correct

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

110. Magnesium keeps on burning in

N₂ as well as CO₂

CO₂

N₂

N₂O

111. The word alkali means

Base salt

Spirit

Base

Ashes

112. The formula of Nitre is

NaCl

KNO₃

Na₂CO₃

NaNO₂

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

They have smaller size

All

They have greater atomic size

They are more reactive

114. Which of the most basic of the following?

Al₂O₃

As₂O₃

Na₂O

BaO

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

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

117. Silicon is found in nature in the form of

Sulphides

Silica or siticates

Oxides

Only silicates

118. The process of aluminum extraction is called

Hall process

Termite process

Contact process

Haber process

119. H₃BO₃ is a

None of these

Monobasic acid

Tribasic acid

Dibasic acid

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

Molecular addition compounds

Ionic compounds

Semiconductors

Molecular crystals

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

In drying of benzene

In drying of ammonia solution

In drying of alcohols

As a general drying agent

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

Li2 CO₃

Na₂ CO₃

Caco₃

KNo₃

123. Chile saltpeter has the chemical formula

Na₂B₄O₇

KNO₃

Na₂CO₃. H₂O

NaNO₃

124. Which is formula of orthoboric acid?

H₂B₄O₇

HBO₂

H₃BO₃

H₆B₄O₉

125. The oxides of beryllium are

Basic

Amphoteric

Acidic

None of these

Page 6 of 7

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

Barium sulphate

Sodium sulphate

Zinc sulphate

Potassium sulphate

127. Plaster of Paris hardens by

Giving out water

Changing into CaCO₃

Combining with water

Giving off CO₂

128. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is a conductor of electricity

It is a conductor of heat

It is not true

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

Graphite

Silica

Diamond

Carbrandum

130. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

Na₂CO₃

PbO

Pb₃O₄

131. The formula of sodium meta borate is

Na₃BO₃

Na₂B₄O₇

NaBO₂

NaBO₃

132. Which is the formula of Chili Salt Peter?

K₂SO₄

NaNo₃

Na₂So₄

KNo₃

133. The oxides of born and silicon are

Natural

Acidic solution

Amphoteric

Basic

134. Bleaching powder is a compound having a formula

CaOCl₂

CaOCl₃

CaCO₃

CaClO

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

1s2 2s2 2p6 3s2 3p1

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

1s2 2s2 2p3

1s2 2s2 2p4

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

137. Which halide has highest melting point?

Nal

NaF

NaCl

NaBr

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

Aluminum

Thallium

Gallainm

Polonium

139. Which is the weakest reducing agent?

140. Setting of cement is an

Exothermic reaction

Neither exothermic nor endothermic

None

Endothermic reaction

141. Sodium conducts electricity because

It gives hydrogen with water

It has only one electron in the outermost orbit

It has mobile electrons

It is a soft alkali metal

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

143. Aluminum reacts with caustic soda to form

Aluminum oxide

Sodium tetra aluminate

Sodium meta-aluminate

Aluminum hydroxide

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

Tincal

Colemanite

Calcium carbonate

Boric acid

145. Mica and bauxite are ores of

146. 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(OH)₂

CaO

Ca(HCO₃)₂

147. Setting of Plaster of Paris involves

Hydration to yield another hydrate

Dehydration

Combination with atmospheric CO₂

Oxidation with atmospheric oxygen

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

All above

Mg(NO₃)₂

Sr(NO₃)₂

Be(NO₃)₂

149. Sodium metal cannot be stored under

Toluene

Alcohol

Kerosene oil

Benzene

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

Polonium

Indium

Aluminum

Boron

Page 7 of 7

151. The elements having highest melting point is

152. The formula of calcium cyanamide is

CaC₂N

CaCHNH₂

CaNCN

Ca(CN)₂

153. Leblanc process is employed in the manufacture of

Plaster of Paris

Potash

Washing soda

Baking soda

154. In diaphragm cell, hydrogen is discharged by

NaCl

Water

HCl

H₂S

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

High nuclear charge and ionization

High ionization potential

High nuclear charge

None of these

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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

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