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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. Setting of Plaster of Paris involves

Combination with atmospheric CO₂

Hydration to yield another hydrate

Dehydration

Oxidation with atmospheric oxygen

2. Cesium oxide will be

Weakly basic

Acidic

Amphoteric

Very strongly basic

3. The aqueous solution of potash alum is

None of these

Basic

Neutral

Acidic

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

Na₂B₄O₇

H₂BO₃

Na₃BO₃

Na₂HBO₃

5. Plaster of Paris hardens by

Giving out water

Combining with water

Changing into CaCO₃

Giving off CO₂

6. 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

CO2 is an independent molecule while SiO2 has network covalent structure

Carbon is non-metal while silicon is semi-metal

7. Silicon is an important constituent of

Amalgams

Haemoglbin

Chlorophyll

Rocks

8. Borax is a white crystalline solid and it is

More soluble in cold water

Soluble only in organic solvents

Insoluble in water

More soluble in hot water

9. Which is the formula of Chili Salt Peter?

K₂SO₄

NaNo₃

Na₂So₄

KNo₃

10. Which of the following is monovalent?

Metals

Metalloids

Alkaline earth metals

Alkali metals

11. Dolomite has the composition

KCL.MgCL₂.6H₂O

CaCl₂.MgCl₂.6H₂O

Na₃AIF₆

CaCO₃.MgCO₃

12. Ordinary window glass is a mixture of

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

Na₂CiO₃ and CO₂

Na₂SiO₃ and SiO₂

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

Clay and silica

Lime stone and clay

Lime stone and gypsum

Lime stone and silica

14. AlCl₃ exist as dimmer because

High charge in nucleus

Al has greater ionization potential

Al has larger radius

Incomplete p-subshell

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

Cr₂O₃

ZnO

MgO

SnO

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

Carbrandum

Graphite

Diamond

Silica

17. 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

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

f – only

s – or – p

d – only

Both d – and f –

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

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

Br₂

NO₂

CO₂

21. Aluminum reacts with caustic soda to form

Sodium tetra aluminate

Sodium meta-aluminate

Aluminum oxide

Aluminum hydroxide

22. Which halide has highest melting point?

Nal

NaF

NaCl

NaBr

23. 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

It is a noble metal

Iron undergoes reaction easily with water

24. The word alkali means

Spirit

Ashes

Base salt

Base

25. Portland cement is manufactured by using

Limestone, clay and sand

Limestone, gypsum and alumina

Limestone, gypsum and sand

Limestone, clay and gypsum

Page 2 of 7

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

Zinc

Copper

Aluminum

Iron

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

NaCl

BaCl₂

KCl

CaCl₂

28. The elements which are very abundant I earth are

B and a

Si and Al

All

Ca and Mg

29. 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

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

Low density

Low electro negativity

Low atomic volume

Low ionization energy

31. Which is the weakest reducing agent?

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

Electropositivity

Atomic volume

All above

Atomic radii

33. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

Water

H₂so₄

NaCl

34. The formula of china clay is

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃. SiF₄

Al₂O₃

Al₂O₃. 2H₂O

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

LiOH

NaOH

CsOH

KOH

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

CO₂

O₂

N₂

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

NH₄Cl

I₂

38. The elements which belong to group IIIA are called

P – block

D – block

S – block

F – block

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

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

Ca and s

Could not apply

41. Red lead is

Pb₃O₄

Pb₄O₃

PbO₂

PbO

42. What is true about physical state of borax?

None of these

White amorphous solid

White crystalline solid

White crystalline sublime solid

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

O₂

CO₂

Noble gases

N₂

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

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

Na₂ CO₃

Li2 CO₃

KNo₃

Caco₃

46. Which is the chemical formula of mica?

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

K2HAL(SiO₄)₃

NaAlSiO₄. 3H₂O

47. Sodium metal cannot be stored under

Toluene

Kerosene oil

Benzene

Alcohol

48. 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

49. Special features of borate glass is that it is

Green in colour

Heat resistant

Low melting

Used to prepare chemical garden

50. Sodium reacts with water more vigorously than lithium because

It is a metal

It has higher atomic weight

It is more electronegative

It is more electropositive

Page 3 of 7

51. Plaster of Paris is a hydrate of

CaSO₄

ZnSO₄

BaSO₄

MgSO₄

52. Galena is an ore of

Lead

Germanium

Gallium

Tin

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

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

Increase

Do not show definite trend

Remain constant

Decrease

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

56. Which is formula of orthoboric acid?

H₃BO₃

H₆B₄O₉

H₂B₄O₇

HBO₂

57. The oxides of beryllium are

None of these

Amphoteric

Acidic

Basic

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

Indium

Polonium

Boron

Aluminum

59. Which is the most amphoteric?

CaO

Na₂O

Al₂O₃

MgO

60. Nitrates of which elements give same products

Li, Na, Be

Li, Mg, Ca

Li, Na, K

All have same products

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

Calcium carbonate

Tincal

Boric acid

Colemanite

62. Alkali earth metals have two electrons outermost

p-orbital

d-orbital

f-orbital

s-orbital

63. Sodium conducts electricity because

It is a soft alkali metal

It has only one electron in the outermost orbit

It has mobile electrons

It gives hydrogen with water

64. Which of the following is most dense?

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

naHco₃

NaNo₃

None

Na₂co₃

66. Alum is not used

In purification of water

In tanning of leather

As an insecticide

As a mordant is dyeing

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

Irregular tetrahedron

Square pyramid (carbon at apex)

None of these

Square planar

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

69. H₃BO₃ is a

Dibasic acid

Tribasic acid

Monobasic acid

None of these

70. The formula of Nitre is

NaNO₂

Na₂CO₃

KNO₃

NaCl

71. Main process for the manufacture of Na₃CO₃ is

Nelson process

Solvay process

Down process

Castner process

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

Mg(NO₃)₂

Sr(NO₃)₂

All above

Be(NO₃)₂

73. Aluminum can jam radar due to

It is a good reflector of radiant energy

It is a conductor of heat

It is not true

It is a conductor of electricity

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

Aluminum oxide

Magnesium oxide

Zinc oxide

Nitrogen pent oxide

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

Molten NaCl

Mercury

Copper

Graphite

Page 4 of 7

76. The formula of sodium meta borate is

Na₃BO₃

NaBO₃

Na₂B₄O₇

NaBO₂

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

Barium sulphate

Zinc sulphate

Sodium sulphate

Potassium sulphate

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

79. 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

Refraction between aluminum and oxygen is endothermic

Reaction between iron and oxygen is endothermic

As compared to iron, aluminum has greater affinity for oxygen

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

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

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

Barium sulphate

Sodium sulphate

Zinc sulphate

Potassium sulphate

83. A pseudo solid is

Rock salt

Glass

Diamond

CaCO₃

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

OCl¯

Cl¯

Cl₂

O₂

85. Mica and bauxite are ores of

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

VIII

IIA

87. Silicon is found in nature in the form of

Oxides

Only silicates

Sulphides

Silica or siticates

88. The element having highest electronegativity among the following is

89. 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

90. Setting of cement is an

None

Endothermic reaction

Exothermic reaction

Neither exothermic nor endothermic

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

CaCO₃

MgCO₃

Al₂O₃

Al(OH)₃

92. What is true about reactivity of aluminum?

None is correct

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

It reacts readily with oxygen of the air at room temperature

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

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

Water repellent

Antifreeze

Hydraulic brakes

Lubricants

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

On heating it melts in its water of crystallization

Its aqueous sol. Is basic in nature

Its empirical formula is KAl(SO₄). 12H₂O

It is used in dyeing industry

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

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

High nuclear charge and ionization

None of these

High nuclear charge

High ionization potential

97. The elements having highest melting point is

98. White lead is

Acidic lead carbonate

Basic lead hydroxide

Basic lead carbonate

Basic lead acetate

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

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

Sulphur

Graphite

None of these

Diamond

Page 5 of 7

101. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water at all temperatures

Readily soluble in cold water

Sparingly soluble in cold water but readily soluble in hot water

Highly soluble in water at all temperatures.

102. 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

Fifth group

Third group

103. 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 metallic character decreases

Their atomic size decreases

Their ionization energy increases

104. Which compound will show the highest lattice energy?

CsF

RbF

NaF

105. Washing soda has formula

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

Na₂CO₃.

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

Electrolytic process

Serpeck’s process

Hoop’s process

Baeyer’s process

107. The formula of calcium cyanamide is

CaC₂N

Ca(CN)₂

CaNCN

CaCHNH₂

108. Causticisation process is used for the preparation of

Caustic potash

Slaked lime

Caustic soda

Baryata solution

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

CsF

Csl

NaF

LiF

110. Chile Salt peter is

Na₂SO₄

Na₂S₂O₃

NaNO₃

KNO₃

111. 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

Ca(HCO₃)₂

CaO

CaCO₃

112. Potassium is kept in

Alcohol

Kerosene

Ammonia

Water

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

114. Born is soil has been considered micronutrient for

All

Proper growth of plants

Soil porosity

Alkalinity of soil

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

Magnesium and potassium

Magnesium and copper

Magnesium and barium

Magnesium and sodium

116. Alkali metal hydroxides are stable to heat except

NaOH

KOH

LiOH

RbOH

117. Microcosmic salt is

Na(NH₄)HPO₄.4H₂O

Na(NH₄). H₂O

K(NH₄)HPO₃. 2H₂O

HPO₄.4H₂O

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

Gallainm

Aluminum

Polonium

Thallium

119. Which one is formula of borax?

Na₂B₄O₇. 4G₂O

Ca₂B₆O₁₁. 5H₂O

NaOH. B₂O₃

Na₂B₄O₇. 10H₂O

120. The halide which is not hydrolyzed is

CCl₄

PbCl₄

SiCl₄

SiF₄

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

122. Boric acid cannot be used

For washing of eyes

For enamels and glazes

An antiseptic medicine

In soda bottles

123. Which of the most basic of the following?

Na₂O

As₂O₃

Al₂O₃

BaO

124. Anodizing of Al is said when

Aluminum prepared electrolytically

Aluminum coated electrically with aluminum oxide

Aluminum allay containing 95% Al

Aluminum obtained at anode

125. Chrome yellow has a formula

PbCrO₄

PbO₂

PbO

Pb₃O₄

Page 6 of 7

126. NaNO₃ decomposes on heating at high temperature to give

Na₂O

NO₂

N₂

O₂

127. Magnesium keeps on burning in

CO₂

N₂O

N₂

N₂ as well as CO₂

128. Metallic luster exhibited by Na can be explained by

Oscillation of loose electrons

Excitation of free protons

Diffusion of sodium ions

Existence of body centered cubic lattice

129. Chile saltpeter has the chemical formula

KNO₃

Na₂B₄O₇

Na₂CO₃. H₂O

NaNO₃

130. The principle constituent of pyrex glass is

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

PH₃

Acetylene

SiCl₄

PCl₅

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

Smaller ionic radii

Lower ionization energy

High melting point

Greater hardness

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

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇

Na₂B₄O₇.5H₂O

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

Sodium aluminum hydroxide

Aluminum peroxide

Sodium aluminum hydride

Sodium meta aluminate

135. 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

To produce alloy

As insulator

136. Aluminum oxide is

Amphoteric oxide

Basic oxide

Acidic oxide

It does not exists

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

Molecular addition compounds

Molecular crystals

Ionic compounds

Semiconductors

138. BF₃ acts as acid according to the concept of

None

Lewis

Arrhenius

Bronsted

139. Which of the following is a Lewis acid?

PCl₃

AsCl₃

NCl₃

AlCl₃

140. The order of alkali metals is

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

Li, Na, K, Rb, Cs, Fr

Fr, Li, Rb, K, Na, Cs

141. The process of aluminum extraction is called

Contact process

Hall process

Haber process

Termite process

142. The chemical composition of white lead is

PbO

Pb(OH)₂.2PbCO₃

Na₂CO₃

Pb₃O₄

143. 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

144. The chief are of aluminum is

Al₂O₃.₂H₂O

Al₂O₃. H₂O

Na₃ALF₆

Al₂O₃

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

Calcium hydroxide

Calcium carbonate

Calcium bicarbonate

Calcium oxide

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

In drying of alcohols

In drying of benzene

As a general drying agent

In drying of ammonia solution

147. Down’s cell is used to prepare

Sodium bicarbonate

Sodium hydroxide

Sodium carbonate

Sodium metal

148. The chemical formula of bauxite is

Al₂O₃

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

None of these

149. Which is the chemical formula of zircon?

Al₂F₂SiO₄

Na₃AlF₆

ZrSiO₄

H₂Mg₃(SiO₃)₄

150. Bleaching powder is a compound having a formula

CaOCl₃

CaOCl₂

CaClO

CaCO₃

Page 7 of 7

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

Cryolite

Feldspar

Fluorspar

Mica

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

153. In diaphragm cell, hydrogen is discharged by

Water

H₂S

HCl

NaCl

154. The oxides of born and silicon are

Amphoteric

Basic

Natural

Acidic solution

155. Leblanc process is employed in the manufacture of

Plaster of Paris

Baking soda

Potash

Washing soda

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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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Malik Tahir

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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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