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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. Born is soil has been considered micronutrient for

Soil porosity

Alkalinity of soil

Proper growth of plants

All

2. The chief are of aluminum is

Al₂O₃.₂H₂O

Al₂O₃

Al₂O₃. H₂O

Na₃ALF₆

3. Al is more reactive than Fe but Al is less easily corroded than Fe because

It is a noble metal

Fe form mono and divalent ions

Iron undergoes reaction easily with water

Oxygen forms a protective reaction easily with water

4. Red lead is

PbO₂

PbO

Pb₄O₃

Pb₃O₄

5. White lead is

Basic lead hydroxide

Basic lead carbonate

Basic lead acetate

Acidic lead carbonate

6. Mica and bauxite are ores of

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

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

NH₄Cl

I₂

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

Could not apply

Ca and s

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

Low electro negativity

Low atomic volume

Low ionization energy

Low density

11. Sodium reacts with water more vigorously than lithium because

It is more electronegative

It has higher atomic weight

It is a metal

It is more electropositive

12. Chile Salt peter is

Na₂SO₄

Na₂S₂O₃

NaNO₃

KNO₃

13. Which is the chemical formula of mica?

NaAlSiO₄. 3H₂O

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

14. Setting of Plaster of Paris involves

Combination with atmospheric CO₂

Hydration to yield another hydrate

Dehydration

Oxidation with atmospheric oxygen

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

16. The formula of Nitre is

NaNO₂

KNO₃

NaCl

Na₂CO₃

17. Which is formula of orthoboric acid?

HBO₂

H₆B₄O₉

H₃BO₃

H₂B₄O₇

18. The oxides of beryllium are

Acidic

Basic

None of these

Amphoteric

19. 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

Its aqueous sol. Is basic in nature

It is used in dyeing industry

20. Ordinary window glass is a mixture of

Na₂O and SiO₂

Na₂SiO₃ and SiO₂

Na₂CiO₃ and CO₂

Na₂SiO₃ and CaSiO₃

21. What is true about physical state of borax?

White amorphous solid

None of these

White crystalline sublime solid

White crystalline solid

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

Na₃BO₃

Na₂HBO₃

H₂BO₃

Na₂B₄O₇

23. Chile saltpeter has the chemical formula

Na₂B₄O₇

KNO₃

Na₂CO₃. H₂O

NaNO₃

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

NaCl

KCl

BaCl₂

CaCl₂

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

As insulator

To remove air bubbles from molten metal

To produce alloy

As nitro meter

Page 2 of 7

26. Plaster of Paris hardens by

Giving out water

Combining with water

Changing into CaCO₃

Giving off CO₂

27. The principle constituent of pyrex glass is

28. The halide which is not hydrolyzed is

SiF₄

SiCl₄

PbCl₄

CCl₄

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

All above

Electropositivity

Atomic volume

Atomic radii

30. Washing soda has formula

Na₂CO₃.

Na₂CO₃. 10H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 7H₂O

31. Which halide has highest melting point?

NaBr

Nal

NaCl

NaF

32. Main process for the manufacture of Na₃CO₃ is

Nelson process

Solvay process

Down process

Castner process

33. Chrome yellow has a formula

PbO

Pb₃O₄

PbO₂

PbCrO₄

34. The aqueous solution of potash alum is

Acidic

Neutral

None of these

Basic

35. The order of alkali metals is

Li, Na, Cs, K, Rb, Fr

Fr, Li, Rb, K, Na, Cs

Na, K, Li, Rb, Fe, Cs

Li, Na, K, Rb, Cs, Fr

36. Alkali metal hydroxides are stable to heat except

NaOH

KOH

LiOH

RbOH

37. Portland cement is manufactured by using

Limestone, clay and sand

Limestone, gypsum and sand

Limestone, gypsum and alumina

Limestone, clay and gypsum

38. Sodium metal cannot be stored under

Benzene

Toluene

Alcohol

Kerosene oil

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

Cl₂

O₂

OCl¯

Cl¯

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

Polonium

Thallium

Gallainm

Aluminum

41. 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

42. Which is the formula of Chili Salt Peter?

Na₂So₄

K₂SO₄

NaNo₃

KNo₃

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

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

In drying of alcohols

As a general drying agent

In drying of ammonia solution

In drying of benzene

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

Molecular addition compounds

Ionic compounds

Molecular crystals

Semiconductors

46. The formula of china clay is

Al₂O₃

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃. 2SiO₂. 2H₂O

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

Lower ionization energy

Greater hardness

Smaller ionic radii

High melting point

48. Cesium oxide will be

Weakly basic

Amphoteric

Acidic

Very strongly basic

49. Boric acid cannot be used

For washing of eyes

An antiseptic medicine

In soda bottles

For enamels and glazes

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

Page 3 of 7

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

Both d – and f –

f – only

s – or – p

d – only

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

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

Carbon atoms have covalent bonds

Carbon atoms of each plane have sp²

There are Van der wall’s forces of attraction between the planes of c atoms

It has delocalized mobile electron

54. Metallic luster exhibited by Na can be explained by

Existence of body centered cubic lattice

Excitation of free protons

Diffusion of sodium ions

Oscillation of loose electrons

55. The process of aluminum extraction is called

Hall process

Contact process

Haber process

Termite process

56. 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

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

58. The elements which belong to group IIIA are called

F – block

S – block

P – block

D – block

59. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water but readily soluble in hot water

Highly soluble in water at all temperatures.

Readily soluble in cold water

Sparingly soluble in cold water at all temperatures

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

Barium sulphate

Sodium sulphate

Potassium sulphate

Zinc sulphate

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

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

SnO

Cr₂O₃

MgO

ZnO

63. The chemical composition of white lead is

PbO

Pb(OH)₂.2PbCO₃

Na₂CO₃

Pb₃O₄

64. AlCl₃ exist as dimmer because

Al has greater ionization potential

Al has larger radius

Incomplete p-subshell

High charge in nucleus

65. Galena is an ore of

Gallium

Germanium

Tin

Lead

66. NaNO₃ decomposes on heating at high temperature to give

NO₂

N₂

Na₂O

O₂

67. Down’s cell is used to prepare

Sodium hydroxide

Sodium carbonate

Sodium metal

Sodium bicarbonate

68. H₃BO₃ is a

Monobasic acid

Tribasic acid

Dibasic acid

None of these

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

70. Silicon is an important constituent of

Amalgams

Rocks

Haemoglbin

Chlorophyll

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

IIA

VIII

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

Al₂O₃

MgCO₃

Al(OH)₃

CaCO₃

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

As compared to iron, aluminum has greater affinity for oxygen

As compared to aluminum, iron has greater affinity for oxygen

Refraction between aluminum and oxygen is endothermic

Reaction between iron and oxygen is endothermic

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

CO₂

NO₂

Br₂

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

CO₂

O₂

N₂

Page 4 of 7

76. Which of the most basic of the following?

As₂O₃

BaO

Na₂O

Al₂O₃

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

CO₂

N₂

Noble gases

O₂

78. 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

79. Which is the most amphoteric?

Al₂O₃

CaO

Na₂O

MgO

80. A pseudo solid is

CaCO₃

Glass

Diamond

Rock salt

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

82. Which is the chemical formula of zircon?

ZrSiO₄

H₂Mg₃(SiO₃)₄

Na₃AlF₆

Al₂F₂SiO₄

83. Microcosmic salt is

HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄)HPO₄.4H₂O

Na(NH₄). H₂O

84. Which is the weakest reducing agent?

85. Potassium is kept in

Kerosene

Water

Ammonia

Alcohol

86. The formula of sodium meta borate is

NaBO₂

Na₂B₄O₇

NaBO₃

Na₃BO₃

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

Magnesium and barium

Magnesium and copper

Magnesium and potassium

Magnesium and sodium

88. Which one is formula of borax?

Na₂B₄O₇. 10H₂O

Na₂B₄O₇. 4G₂O

NaOH. B₂O₃

Ca₂B₆O₁₁. 5H₂O

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

Remain constant

Decrease

Increase

Do not show definite trend

90. Which of the following is monovalent?

Alkali metals

Alkaline earth metals

Metals

Metalloids

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

Third group

First transition series

Fifth group

First group

92. Choose the correct statement

Graphite is the hardest which lamp black is the softest

Diamond is the hardest and coke is the softest

Diamond is the hardest and graphite is the softest

Coal is the hardest and coke is the softest

93. Silicon is found in nature in the form of

Silica or siticates

Sulphides

Only silicates

Oxides

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

Tincal

Boric acid

Colemanite

Calcium carbonate

95. Aluminum can jam radar due to

It is not true

It is a conductor of heat

It is a conductor of electricity

It is a good reflector of radiant energy

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

Silica

Diamond

Carbrandum

Graphite

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

Aluminum peroxide

Sodium aluminum hydride

Sodium meta aluminate

Sodium aluminum hydroxide

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

SiCl₄

PH₃

Acetylene

PCl₅

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

Mica

Cryolite

Feldspar

Fluorspar

100. The formula of calcium cyanamide is

CaC₂N

CaCHNH₂

Ca(CN)₂

CaNCN

Page 5 of 7

101. What is true about reactivity of aluminum?

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

It reacts readily with oxygen of the air at room temperature

None is correct

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

102. Alkali earth metals have two electrons outermost

p-orbital

s-orbital

f-orbital

d-orbital

103. Which of the following is a Lewis acid?

AsCl₃

PCl₃

NCl₃

AlCl₃

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

High nuclear charge

High ionization potential

None of these

High nuclear charge and ionization

105. Sodium conducts electricity because

It is a soft alkali metal

It has mobile electrons

It has only one electron in the outermost orbit

It gives hydrogen with water

106. Setting of cement is an

Exothermic reaction

None

Endothermic reaction

Neither exothermic nor endothermic

107. The elements having highest melting point is

108. In diaphragm cell, hydrogen is discharged by

NaCl

Water

HCl

H₂S

109. Dolomite has the composition

CaCl₂.MgCl₂.6H₂O

Na₃AIF₆

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

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

All above

Sr(NO₃)₂

Mg(NO₃)₂

Be(NO₃)₂

111. The element having highest electronegativity among the following is

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

None

NaNo₃

naHco₃

Na₂co₃

113. Which of the following is most dense?

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

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

Zinc sulphate

Barium sulphate

Potassium sulphate

Sodium sulphate

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

Copper

Zinc

Aluminum

Iron

117. Causticisation process is used for the preparation of

Slaked lime

Caustic potash

Baryata solution

Caustic soda

118. Anodizing of Al is said when

Aluminum allay containing 95% Al

Aluminum coated electrically with aluminum oxide

Aluminum prepared electrolytically

Aluminum obtained at anode

119. Which compound will show the highest lattice energy?

RbF

NaF

CsF

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

Calcium bicarbonate

Calcium hydroxide

Calcium oxide

Calcium carbonate

121. Leblanc process is employed in the manufacture of

Baking soda

Washing soda

Potash

Plaster of Paris

122. Ammonia may be prepared by heating ammonium chloride with

Water

NaCl

H₂so₄

Aqueous NaoH

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

CO2 is an independent molecule while SiO2 has network covalent structure

Silicon has all sigma bonds

Carbon is non-metal while silicon is semi-metal

CO2 forms multiple bond while silicon does not form multiple bonds

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

Na₂B₄O₇

Na₂B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇.5H₂O

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

Polonium

Indium

Aluminum

Boron

Page 6 of 7

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

They have greater atomic size

They are more reactive

They have smaller size

All

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

128. BF₃ acts as acid according to the concept of

Bronsted

Arrhenius

None

Lewis

129. Bleaching powder is a compound having a formula

CaCO₃

CaClO

CaOCl₂

CaOCl₃

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

Li2 CO₃

KNo₃

Caco₃

Na₂ CO₃

131. 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 metallic character decreases

Their atomic size decreases

132. The chemical formula of bauxite is

Al₂O₃. SiF₄

None of these

Al₂O₃

Al₂O₃. 2H₂O

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

None of these

Square pyramid (carbon at apex)

Square planar

Irregular tetrahedron

134. The oxides of born and silicon are

Basic

Amphoteric

Acidic solution

Natural

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

None of these

Sulphur

Diamond

Graphite

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

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

Antifreeze

Lubricants

Water repellent

Hydraulic brakes

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

Electrolytic process

Serpeck’s process

Baeyer’s process

Hoop’s process

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

CsOH

NaOH

KOH

LiOH

140. The elements which are very abundant I earth are

All

Ca and Mg

B and a

Si and Al

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

Copper

Mercury

Graphite

Molten NaCl

142. Alum is not used

As an insecticide

In tanning of leather

In purification of water

As a mordant is dyeing

143. Special features of borate glass is that it is

Low melting

Green in colour

Heat resistant

Used to prepare chemical garden

144. Aluminum oxide is

Amphoteric oxide

Basic oxide

Acidic oxide

It does not exists

145. Magnesium keeps on burning in

N₂

N₂O

CO₂

N₂ as well as CO₂

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

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

Magnesium oxide

Nitrogen pent oxide

Aluminum oxide

Zinc oxide

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

1s2 2s2 2p4

1s2 2s2 2p6 3s2 3p1

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

1s2 2s2 2p3

149. 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

150. Nitrates of which elements give same products

Li, Na, Be

All have same products

Li, Na, K

Li, Mg, Ca

Page 7 of 7

151. The word alkali means

Spirit

Ashes

Base

Base salt

152. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Aluminum hydroxide

Sodium tetra aluminate

Aluminum oxide

153. Plaster of Paris is a hydrate of

ZnSO₄

CaSO₄

BaSO₄

MgSO₄

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

Csl

NaF

LiF

CsF

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

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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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