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MDCAT Chemistry S-Block Elements Test Online

Malik TahirLast Updated: May 24, 2025

Chemistry S-Block Elements MCQS Online Test

MDCAT 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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MDCAT Chemistry S-Block Elements Test

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Page 1 of 7

Chemistry

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

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

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

Polonium

Gallainm

Aluminum

Thallium

4. Silicon is an important constituent of

Amalgams

Chlorophyll

Haemoglbin

Rocks

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

Silicon has all sigma bonds

CO2 forms multiple bond while silicon does not form multiple bonds

CO2 is an independent molecule while SiO2 has network covalent structure

Carbon is non-metal while silicon is semi-metal

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

7. Causticisation process is used for the preparation of

Caustic potash

Slaked lime

Caustic soda

Baryata solution

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

Hydraulic brakes

Lubricants

Water repellent

Antifreeze

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

High melting point

Lower ionization energy

Smaller ionic radii

Greater hardness

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

Decrease

Do not show definite trend

Remain constant

Increase

11. 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

12. A pseudo solid is

CaCO₃

Glass

Diamond

Rock salt

13. The word alkali means

Ashes

Base

Base salt

Spirit

14. Potassium is kept in

Water

Kerosene

Alcohol

Ammonia

15. Aluminum reacts with caustic soda to form

Sodium tetra aluminate

Aluminum oxide

Aluminum hydroxide

Sodium meta-aluminate

16. The elements which belong to group IIIA are called

D – block

S – block

P – block

F – block

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

Zinc sulphate

Barium sulphate

Potassium sulphate

Sodium sulphate

18. Cesium oxide will be

Weakly basic

Amphoteric

Acidic

Very strongly basic

19. The chemical formula of bauxite is

None of these

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃

20. Red lead is

PbO

Pb₄O₃

PbO₂

Pb₃O₄

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

O₂

Noble gases

N₂

CO₂

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

In drying of benzene

As a general drying agent

In drying of alcohols

In drying of ammonia solution

23. Mica and bauxite are ores of

24. Which is the chemical formula of mica?

KH₂Al₃(SiO₄)₃

NaAlSiO₄. 3H₂O

K2HAL(SiO₄)₃

NaKSiO₄. 10H₂O

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

Na₂B₃O₆. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₄O₇. 10H₂O

Page 2 of 7

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

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

Mercury

Copper

Molten NaCl

Graphite

28. Boric acid cannot be used

For washing of eyes

For enamels and glazes

An antiseptic medicine

In soda bottles

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

IIA

VIII

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

LiF

NaF

Csl

CsF

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

NO₂

Br₂

CO₂

32. In diaphragm cell, hydrogen is discharged by

H₂S

NaCl

Water

HCl

33. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

PbO

Na₂CO₃

Pb₃O₄

34. Born is soil has been considered micronutrient for

Proper growth of plants

Alkalinity of soil

All

Soil porosity

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

36. Setting of cement is an

None

Neither exothermic nor endothermic

Endothermic reaction

Exothermic reaction

37. Down’s cell is used to prepare

Sodium metal

Sodium hydroxide

Sodium carbonate

Sodium bicarbonate

38. Bleaching powder is a compound having a formula

CaOCl₂

CaOCl₃

CaClO

CaCO₃

39. Silicon is found in nature in the form of

Sulphides

Oxides

Only silicates

Silica or siticates

40. Borax is a white crystalline solid and it is

More soluble in hot water

More soluble in cold water

Insoluble in water

Soluble only in organic solvents

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

42. The elements which are very abundant I earth are

Si and Al

B and a

All

Ca and Mg

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

Barium sulphate

Sodium sulphate

Zinc sulphate

Potassium sulphate

44. Plaster of Paris is a hydrate of

BaSO₄

ZnSO₄

CaSO₄

MgSO₄

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

Cryolite

Feldspar

Fluorspar

Mica

46. Special features of borate glass is that it is

Green in colour

Heat resistant

Used to prepare chemical garden

Low melting

47. The oxides of beryllium are

None of these

Basic

Acidic

Amphoteric

48. 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 ionization energy increases

Their atomic size decreases

The stability of +2 oxidation state increases

49. 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

50. The chief are of aluminum is

Al₂O₃

Al₂O₃.₂H₂O

Al₂O₃. H₂O

Na₃ALF₆

Page 3 of 7

51. 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

52. Which compound will show the highest lattice energy?

RbF

CsF

NaF

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

Aluminum peroxide

Sodium aluminum hydroxide

Sodium meta aluminate

Sodium aluminum hydride

54. Which is the chemical formula of zircon?

ZrSiO₄

Al₂F₂SiO₄

H₂Mg₃(SiO₃)₄

Na₃AlF₆

55. Which of the most basic of the following?

Na₂O

Al₂O₃

BaO

As₂O₃

56. The formula of Nitre is

KNO₃

NaNO₂

Na₂CO₃

NaCl

57. Which is the most amphoteric?

CaO

Al₂O₃

Na₂O

MgO

58. Chile saltpeter has the chemical formula

Na₂CO₃. H₂O

KNO₃

Na₂B₄O₇

NaNO₃

59. 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

60. Alkali metal hydroxides are stable to heat except

NaOH

KOH

LiOH

RbOH

61. Nitrates of which elements give same products

Li, Na, Be

Li, Mg, Ca

Li, Na, K

All have same products

62. The formula of sodium meta borate is

NaBO₂

NaBO₃

Na₃BO₃

Na₂B₄O₇

63. Leblanc process is employed in the manufacture of

Washing soda

Potash

Baking soda

Plaster of Paris

64. Portland cement is manufactured by using

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, gypsum and alumina

Limestone, clay and gypsum

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

Low electro negativity

Low ionization energy

Low atomic volume

Low density

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

Could not apply

Ca and s

67. Washing soda has formula

Na₂CO₃. 7H₂O

Na₂CO₃.

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

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

Refraction between aluminum and oxygen is endothermic

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

69. The order of alkali metals is

Fr, Li, Rb, K, Na, Cs

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

Li, Na, K, Rb, Cs, Fr

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

NaOH

KOH

LiOH

CsOH

71. White lead is

Basic lead acetate

Basic lead hydroxide

Basic lead carbonate

Acidic lead carbonate

72. Microcosmic salt is

K(NH₄)HPO₃. 2H₂O

Na(NH₄)HPO₄.4H₂O

Na(NH₄). H₂O

HPO₄.4H₂O

73. Choose the correct statement

Diamond is the hardest and graphite is the softest

Coal is the hardest and coke is the softest

Diamond is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

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

Li2 CO₃

Caco₃

Na₂ CO₃

KNo₃

75. The process of aluminum extraction is called

Contact process

Termite process

Hall process

Haber process

Page 4 of 7

76. Anodizing of Al is said when

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

Aluminum obtained at anode

Aluminum coated electrically with aluminum oxide

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

All above

Atomic radii

Atomic volume

Electropositivity

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

79. Chile Salt peter is

NaNO₃

KNO₃

Na₂SO₄

Na₂S₂O₃

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

None of these

Sulphur

Diamond

Graphite

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

Irregular tetrahedron

Square planar

None of these

Square pyramid (carbon at apex)

82. What is true about physical state of borax?

None of these

White crystalline sublime solid

White crystalline solid

White amorphous solid

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

Sr(NO₃)₂

All above

Be(NO₃)₂

Mg(NO₃)₂

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

85. Galena is an ore of

Gallium

Lead

Tin

Germanium

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

Na₂HBO₃

H₂BO₃

Na₂B₄O₇

Na₃BO₃

87. Which is the weakest reducing agent?

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

Tincal

Colemanite

Calcium carbonate

Boric acid

89. Which of the following is most dense?

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

Semiconductors

Ionic compounds

Molecular crystals

Molecular addition compounds

91. Metallic luster exhibited by Na can be explained by

Oscillation of loose electrons

Existence of body centered cubic lattice

Excitation of free protons

Diffusion of sodium ions

92. Sodium conducts electricity because

It is a soft alkali metal

It gives hydrogen with water

It has mobile electrons

It has only one electron in the outermost orbit

93. Which is the formula of Chili Salt Peter?

Na₂So₄

NaNo₃

KNo₃

K₂SO₄

94. The principle constituent of pyrex glass is

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

Hoop’s process

Serpeck’s process

Electrolytic process

Baeyer’s process

96. H₃BO₃ is a

None of these

Tribasic acid

Dibasic acid

Monobasic acid

97. The formula of calcium cyanamide is

Ca(CN)₂

CaCHNH₂

CaC₂N

CaNCN

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

They have smaller size

All

They are more reactive

They have greater atomic size

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

NH₄Cl

I₂

100. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. 2H₂O

Al₂O₃

Al₂O₃. SiF₄

Page 5 of 7

101. Sodium reacts with water more vigorously than lithium because

It is more electronegative

It is more electropositive

It is a metal

It has higher atomic weight

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

103. Alum is not used

In tanning of leather

In purification of water

As an insecticide

As a mordant is dyeing

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

To remove air bubbles from molten metal

As insulator

To produce alloy

As nitro meter

105. The halide which is not hydrolyzed is

CCl₄

SiCl₄

SiF₄

PbCl₄

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

Carbrandum

Silica

Diamond

Graphite

107. Which halide has highest melting point?

Nal

NaCl

NaF

NaBr

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

NaNo₃

Na₂co₃

None

naHco₃

109. What is true about reactivity of aluminum?

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

It reacts readily with oxygen of the air at room temperature

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

None is correct

110. 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

111. The elements having highest melting point is

112. The element having highest electronegativity among the following is

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

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

Aluminum

Iron

Copper

Zinc

115. AlCl₃ exist as dimmer because

High charge in nucleus

Incomplete p-subshell

Al has greater ionization potential

Al has larger radius

116. 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?

CaO

Ca(OH)₂

Ca(HCO₃)₂

CaCO₃

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

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p4

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

1s2 2s2 2p3

118. Plaster of Paris hardens by

Giving off CO₂

Giving out water

Combining with water

Changing into CaCO₃

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

Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

120. What is true about solubility of orthoboric acid?

Readily soluble in cold water

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

121. Ammonia may be prepared by heating ammonium chloride with

NaCl

Water

Aqueous NaoH

H₂so₄

122. The oxides of born and silicon are

Natural

Acidic solution

Amphoteric

Basic

123. BF₃ acts as acid according to the concept of

Arrhenius

None

Lewis

Bronsted

124. Main process for the manufacture of Na₃CO₃ is

Nelson process

Solvay process

Down process

Castner process

125. Sodium metal cannot be stored under

Alcohol

Kerosene oil

Benzene

Toluene

Page 6 of 7

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

CO₂

O₂

N₂

127. The aqueous solution of potash alum is

Basic

None of these

Acidic

Neutral

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

129. 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

130. NaNO₃ decomposes on heating at high temperature to give

O₂

NO₂

Na₂O

N₂

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

KCl

NaCl

BaCl₂

CaCl₂

132. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

Na₂SiO₃ and SiO₂

133. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is a conductor of heat

It is a conductor of electricity

It is not true

134. Setting of Plaster of Paris involves

Hydration to yield another hydrate

Oxidation with atmospheric oxygen

Dehydration

Combination with atmospheric CO₂

135. Which of the following is a Lewis acid?

AlCl₃

PCl₃

NCl₃

AsCl₃

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

f – only

d – only

Both d – and f –

s – or – p

137. Chrome yellow has a formula

PbCrO₄

Pb₃O₄

PbO₂

PbO

138. 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

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

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

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

SnO

Cr₂O₃

MgO

ZnO

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

Magnesium and sodium

Magnesium and copper

Magnesium and barium

Magnesium and potassium

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

Acetylene

SiCl₄

PH₃

PCl₅

144. Dolomite has the composition

CaCl₂.MgCl₂.6H₂O

Na₃AIF₆

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

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

OCl¯

Cl₂

O₂

Cl¯

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

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

Zinc oxide

Nitrogen pent oxide

Magnesium oxide

Aluminum oxide

148. Which one is formula of borax?

Na₂B₄O₇. 4G₂O

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 10H₂O

NaOH. B₂O₃

149. Aluminum oxide is

It does not exists

Acidic oxide

Amphoteric oxide

Basic oxide

150. Magnesium keeps on burning in

N₂

CO₂

N₂O

N₂ as well as CO₂

Page 7 of 7

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

Al(OH)₃

MgCO₃

CaCO₃

Al₂O₃

152. Which is formula of orthoboric acid?

HBO₂

H₆B₄O₉

H₃BO₃

H₂B₄O₇

153. Which of the following is monovalent?

Alkaline earth metals

Metals

Metalloids

Alkali metals

154. Alkali earth metals have two electrons outermost

p-orbital

f-orbital

d-orbital

s-orbital

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

Indium

Boron

Polonium

Aluminum

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Malik TahirLast Updated: May 24, 2025

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5 Comments

Faheem says:

August 5, 2021 at 12:07 pm

Good

HADIA KARIM says:

November 4, 2020 at 1:31 pm

chile saltpetre has chemical formula=NaNO3 it’s A

ismail says:

September 18, 2020 at 10:54 pm

i want to solve all sort of tests fo biology chemistry and physicsplease guide me

ismail says:

September 18, 2020 at 10:53 pm

i want to solve all sort of tests fo biology chemistry and physics

ismail says:

September 18, 2020 at 10:52 pm

i want to solve all sort of tests

MDCAT Chemistry S-Block Elements Test Online

Chemistry S-Block Elements MCQS Online Test

MDCAT Chemistry S-Block Elements Chapter Online Test

MDCAT Chemistry S-Block Elements Test

Chemistry

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Chemistry S-Block Elements MCQS Online Test

MDCAT Chemistry S-Block Elements Chapter Online Test

MDCAT Chemistry S-Block Elements Test

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