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

O₂

N₂

CO₂

Noble gases

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

Potassium sulphate

Sodium sulphate

Zinc sulphate

Barium sulphate

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

CO₂

N₂

O₂

4. The principle constituent of pyrex glass is

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

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

Zinc

Iron

Aluminum

Copper

7. NaNO₃ decomposes on heating at high temperature to give

O₂

NO₂

N₂

Na₂O

8. Galena is an ore of

Germanium

Gallium

Tin

Lead

9. Which of the following is monovalent?

Metals

Alkaline earth metals

Metalloids

Alkali metals

10. Which of the following is most dense?

11. Washing soda has formula

Na₂CO₃. 10H₂O

Na₂CO₃.

Na₂CO₃. 7H₂O

Na₂CO₃. 3H₂O

12. Sodium metal cannot be stored under

Alcohol

Toluene

Kerosene oil

Benzene

13. Which is the most amphoteric?

Al₂O₃

CaO

Na₂O

MgO

14. 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

15. Which is the chemical formula of mica?

NaKSiO₄. 10H₂O

KH₂Al₃(SiO₄)₃

K2HAL(SiO₄)₃

NaAlSiO₄. 3H₂O

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

Silica

Diamond

Carbrandum

Graphite

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

Irregular tetrahedron

None of these

Square pyramid (carbon at apex)

Square planar

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

Sr(NO₃)₂

All above

Mg(NO₃)₂

Be(NO₃)₂

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

On heating it melts in its water of crystallization

It is used in dyeing industry

Its empirical formula is KAl(SO₄). 12H₂O

Its aqueous sol. Is basic in nature

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

Fluorspar

Feldspar

Mica

Cryolite

21. Silicon is found in nature in the form of

Only silicates

Sulphides

Silica or siticates

Oxides

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

23. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

Na₂SiO₃ and SiO₂

Na₂O and SiO₂

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

LiF

Csl

NaF

CsF

25. 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

Page 2 of 7

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

Aluminum oxide

Nitrogen pent oxide

Magnesium oxide

Zinc oxide

27. Mica and bauxite are ores of

28. The elements which are very abundant I earth are

Si and Al

Ca and Mg

All

B and a

29. Which of the most basic of the following?

BaO

Al₂O₃

As₂O₃

Na₂O

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

Low ionization energy

Low electro negativity

Low density

Low atomic volume

31. Sodium conducts electricity because

It is a soft alkali metal

It gives hydrogen with water

It has only one electron in the outermost orbit

It has mobile electrons

32. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

NaCl

Water

H₂so₄

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

IIA

VIII

35. H₃BO₃ is a

Tribasic acid

Dibasic acid

None of these

Monobasic acid

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

None of these

Sulphur

Diamond

Graphite

37. Chile saltpeter has the chemical formula

Na₂B₄O₇

Na₂CO₃. H₂O

NaNO₃

KNO₃

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

Caco₃

Na₂ CO₃

Li2 CO₃

KNo₃

39. Portland cement is manufactured by using

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, clay and gypsum

40. 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 ionization energy increases

Their atomic size decreases

Their metallic character decreases

41. What is true about reactivity of aluminum?

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

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

42. The oxides of beryllium are

Acidic

None of these

Amphoteric

Basic

43. Aluminum oxide is

Acidic oxide

It does not exists

Amphoteric oxide

Basic oxide

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

As nitro meter

As insulator

To produce alloy

To remove air bubbles from molten metal

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

Water repellent

Antifreeze

Hydraulic brakes

Lubricants

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

Cr₂O₃

ZnO

MgO

SnO

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

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

Do not show definite trend

Remain constant

Decrease

Increase

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

CaCl₂

KCl

BaCl₂

NaCl

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

Page 3 of 7

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

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

CaCO₃

Al₂O₃

Al(OH)₃

MgCO₃

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

Atomic volume

Electropositivity

Atomic radii

All above

54. Down’s cell is used to prepare

Sodium metal

Sodium carbonate

Sodium bicarbonate

Sodium hydroxide

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

56. Cesium oxide will be

Amphoteric

Weakly basic

Very strongly basic

Acidic

57. The chief are of aluminum is

Al₂O₃.₂H₂O

Al₂O₃. H₂O

Al₂O₃

Na₃ALF₆

58. Chile Salt peter is

Na₂S₂O₃

KNO₃

Na₂SO₄

NaNO₃

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

60. 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

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

Na₂co₃

naHco₃

None

NaNo₃

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

SiCl₄

PCl₅

PH₃

Acetylene

63. Which compound will show the highest lattice energy?

CsF

RbF

NaF

64. Aluminum can jam radar due to

It is not true

It is a conductor of electricity

It is a conductor of heat

It is a good reflector of radiant energy

65. White lead is

Basic lead carbonate

Acidic lead carbonate

Basic lead hydroxide

Basic lead acetate

66. Main process for the manufacture of Na₃CO₃ is

Castner process

Nelson process

Solvay process

Down process

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

68. Which is the weakest reducing agent?

69. Alum is not used

In purification of water

As a mordant is dyeing

In tanning of leather

As an insecticide

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

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

High nuclear charge

High nuclear charge and ionization

None of these

High ionization potential

72. The formula of Nitre is

NaNO₂

Na₂CO₃

NaCl

KNO₃

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

Cl₂

Cl¯

O₂

OCl¯

74. 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

75. The word alkali means

Base

Ashes

Spirit

Base salt

Page 4 of 7

76. The oxides of born and silicon are

Natural

Acidic solution

Basic

Amphoteric

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

Could not apply

Ca and s

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

Lime stone and silica

Clay and silica

Lime stone and gypsum

Lime stone and clay

79. Alkali metal hydroxides are stable to heat except

RbOH

NaOH

LiOH

KOH

80. Sodium reacts with water more vigorously than lithium because

It is more electropositive

It has higher atomic weight

It is more electronegative

It is a metal

81. Chrome yellow has a formula

PbO₂

Pb₃O₄

PbCrO₄

PbO

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

CO2 forms multiple bond while silicon does not form multiple bonds

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

83. What is true about physical state of borax?

White crystalline sublime solid

White amorphous solid

None of these

White crystalline solid

84. 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

85. BF₃ acts as acid according to the concept of

Lewis

None

Bronsted

Arrhenius

86. Anodizing of Al is said when

Aluminum obtained at anode

Aluminum coated electrically with aluminum oxide

Aluminum prepared electrolytically

Aluminum allay containing 95% Al

87. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₃

NaBO₂

Na₃BO₃

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

Electrolytic process

Baeyer’s process

Hoop’s process

Serpeck’s process

89. A pseudo solid is

Rock salt

Glass

Diamond

CaCO₃

90. Nitrates of which elements give same products

All have same products

Li, Na, K

Li, Mg, Ca

Li, Na, Be

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

They are more reactive

All

They have smaller size

They have greater atomic size

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

Calcium hydroxide

Calcium bicarbonate

Calcium carbonate

Calcium oxide

93. The formula of china clay is

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

94. Magnesium keeps on burning in

N₂O

CO₂

N₂ as well as CO₂

N₂

95. Plaster of Paris is a hydrate of

CaSO₄

MgSO₄

ZnSO₄

BaSO₄

96. Which one is formula of borax?

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 4G₂O

NaOH. B₂O₃

Na₂B₄O₇. 10H₂O

97. Microcosmic salt is

Na(NH₄)HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄). H₂O

HPO₄.4H₂O

98. Dolomite has the composition

CaCO₃.MgCO₃

CaCl₂.MgCl₂.6H₂O

Na₃AIF₆

KCL.MgCL₂.6H₂O

99. Setting of cement is an

Endothermic reaction

None

Exothermic reaction

Neither exothermic nor endothermic

100. Which is the chemical formula of zircon?

Al₂F₂SiO₄

ZrSiO₄

Na₃AlF₆

H₂Mg₃(SiO₃)₄

Page 5 of 7

101. 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

Ca(OH)₂

CaCO₃

CaO

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

103. Which of the following is a Lewis acid?

AsCl₃

PCl₃

NCl₃

AlCl₃

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

CO₂

Br₂

NO₂

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

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

Polonium

Gallainm

Aluminum

Thallium

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

Boron

Indium

Aluminum

Polonium

108. 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

109. 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

110. The halide which is not hydrolyzed is

CCl₄

SiCl₄

PbCl₄

SiF₄

111. Setting of Plaster of Paris involves

Oxidation with atmospheric oxygen

Hydration to yield another hydrate

Dehydration

Combination with atmospheric CO₂

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

Na₂B₄O₇. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

Na₂B₃O₆. 10H₂O

113. The formula of calcium cyanamide is

Ca(CN)₂

CaCHNH₂

CaNCN

CaC₂N

114. The element having highest electronegativity among the following is

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

Magnesium and copper

Magnesium and sodium

Magnesium and potassium

Magnesium and barium

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

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

Aluminum peroxide

Sodium meta aluminate

Sodium aluminum hydroxide

Sodium aluminum hydride

118. AlCl₃ exist as dimmer because

High charge in nucleus

Al has greater ionization potential

Incomplete p-subshell

Al has larger radius

119. Causticisation process is used for the preparation of

Caustic soda

Slaked lime

Baryata solution

Caustic potash

120. Leblanc process is employed in the manufacture of

Potash

Plaster of Paris

Baking soda

Washing soda

121. The aqueous solution of potash alum is

Basic

Acidic

Neutral

None of these

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

In drying of benzene

In drying of alcohols

In drying of ammonia solution

As a general drying agent

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

Zinc sulphate

Barium sulphate

Potassium sulphate

Sodium sulphate

124. Which is formula of orthoboric acid?

H₂B₄O₇

HBO₂

H₃BO₃

H₆B₄O₉

125. Born is soil has been considered micronutrient for

All

Soil porosity

Alkalinity of soil

Proper growth of plants

Page 6 of 7

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

Smaller ionic radii

High melting point

Lower ionization energy

Greater hardness

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

Graphite

Molten NaCl

Mercury

Copper

128. In diaphragm cell, hydrogen is discharged by

Water

HCl

NaCl

H₂S

129. Silicon is an important constituent of

Haemoglbin

Chlorophyll

Amalgams

Rocks

130. Which halide has highest melting point?

NaBr

Nal

NaCl

NaF

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

LiOH

KOH

NaOH

CsOH

132. The chemical formula of bauxite is

Al₂O₃. SiF₄

Al₂O₃

Al₂O₃. 2H₂O

None of these

133. Bleaching powder is a compound having a formula

CaOCl₂

CaCO₃

CaOCl₃

CaClO

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

Semiconductors

Molecular crystals

Molecular addition compounds

Ionic compounds

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

H₂BO₃

Na₃BO₃

Na₂HBO₃

Na₂B₄O₇

136. Alkali earth metals have two electrons outermost

s-orbital

f-orbital

d-orbital

p-orbital

137. Boric acid cannot be used

An antiseptic medicine

For enamels and glazes

For washing of eyes

In soda bottles

138. Aluminum reacts with caustic soda to form

Aluminum hydroxide

Aluminum oxide

Sodium meta-aluminate

Sodium tetra aluminate

139. 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

Carbon atoms of each plane have sp²

It has delocalized mobile electron

Carbon atoms have covalent bonds

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

Tincal

Boric acid

Calcium carbonate

Colemanite

141. Plaster of Paris hardens by

Giving off CO₂

Changing into CaCO₃

Giving out water

Combining with water

142. The elements which belong to group IIIA are called

D – block

F – block

S – block

P – block

143. Red lead is

Pb₃O₄

PbO₂

PbO

Pb₄O₃

144. Potassium is kept in

Alcohol

Water

Ammonia

Kerosene

145. Choose the correct statement

Coal is the hardest and coke is the softest

Diamond is the hardest and graphite is the softest

Diamond is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

146. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water at all temperatures

Sparingly soluble in cold water but readily soluble in hot water

Readily soluble in cold water

Highly soluble in water at all temperatures.

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

148. The elements having highest melting point is

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

NH₄Cl

I₂

150. Borax is a white crystalline solid and it is

More soluble in hot water

More soluble in cold water

Soluble only in organic solvents

Insoluble in water

Page 7 of 7

151. Which is the formula of Chili Salt Peter?

Na₂So₄

K₂SO₄

NaNo₃

KNo₃

152. The process of aluminum extraction is called

Hall process

Contact process

Termite process

Haber process

153. Special features of borate glass is that it is

Heat resistant

Green in colour

Low melting

Used to prepare chemical garden

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

155. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

Pb₃O₄

PbO

Na₂CO₃

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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

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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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