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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. Plaster of Paris hardens by

Changing into CaCO₃

Giving out water

Giving off CO₂

Combining with water

2. The elements which belong to group IIIA are called

D – block

F – block

P – block

S – block

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

Zinc

Iron

Copper

Aluminum

4. The formula of calcium cyanamide is

CaNCN

Ca(CN)₂

CaC₂N

CaCHNH₂

5. Which is the chemical formula of mica?

NaAlSiO₄. 3H₂O

K2HAL(SiO₄)₃

KH₂Al₃(SiO₄)₃

NaKSiO₄. 10H₂O

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

NH₄Cl

I₂

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

Fluorspar

Cryolite

Mica

Feldspar

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

Oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions

It is a noble metal

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

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

1s2 2s2 2p6 3s2 3p1

1s2 2s2 2p4

1s2 2s2 2p3

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

Barium sulphate

Potassium sulphate

Zinc sulphate

Sodium sulphate

11. Aluminum can jam radar due to

It is a conductor of electricity

It is not true

It is a good reflector of radiant energy

It is a conductor of heat

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

First group

Third group

Fifth group

First transition series

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

14. 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.

15. The aqueous solution of potash alum is

Neutral

Basic

None of these

Acidic

16. Mica and bauxite are ores of

17. Potassium is kept in

Alcohol

Ammonia

Kerosene

Water

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

Magnesium and barium

Magnesium and copper

Magnesium and sodium

Magnesium and potassium

19. AlCl₃ exist as dimmer because

Al has larger radius

High charge in nucleus

Incomplete p-subshell

Al has greater ionization potential

20. Washing soda has formula

Na₂CO₃. 7H₂O

Na₂CO₃. 10H₂O

Na₂CO₃.

Na₂CO₃. 3H₂O

21. Portland cement is manufactured by using

Limestone, clay and gypsum

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, gypsum and alumina

22. 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

23. The chemical formula of bauxite is

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃

None of these

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

Electropositivity

Atomic radii

All above

Atomic volume

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

Remain constant

Increase

Do not show definite trend

Decrease

Page 2 of 7

26. A pseudo solid is

Rock salt

CaCO₃

Diamond

Glass

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

Carbon atoms have covalent bonds

It has delocalized mobile electron

Carbon atoms of each plane have sp²

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

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

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

Low density

Low atomic volume

Low electro negativity

Low ionization energy

30. Chile saltpeter has the chemical formula

Na₂B₄O₇

NaNO₃

Na₂CO₃. H₂O

KNO₃

31. Galena is an ore of

Gallium

Germanium

Lead

Tin

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

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

34. 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

35. H₃BO₃ is a

None of these

Tribasic acid

Monobasic acid

Dibasic acid

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

f – only

s – or – p

Both d – and f –

d – only

37. Boric acid cannot be used

For enamels and glazes

For washing of eyes

An antiseptic medicine

In soda bottles

38. Sodium metal cannot be stored under

Benzene

Kerosene oil

Alcohol

Toluene

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

High nuclear charge and ionization

High nuclear charge

None of these

High ionization potential

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

41. What is true about physical state of borax?

White amorphous solid

White crystalline solid

None of these

White crystalline sublime solid

42. Anodizing of Al is said when

Aluminum prepared electrolytically

Aluminum obtained at anode

Aluminum allay containing 95% Al

Aluminum coated electrically with aluminum oxide

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

Polonium

Thallium

Aluminum

Gallainm

44. Which is the formula of Chili Salt Peter?

NaNo₃

KNo₃

K₂SO₄

Na₂So₄

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

46. 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

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

OCl¯

O₂

Cl₂

Cl¯

48. 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

49. The process of aluminum extraction is called

Contact process

Termite process

Haber process

Hall process

50. Alkali metal hydroxides are stable to heat except

RbOH

KOH

LiOH

NaOH

Page 3 of 7

51. BF₃ acts as acid according to the concept of

Arrhenius

Lewis

Bronsted

None

52. 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

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

Csl

CsF

NaF

LiF

54. In diaphragm cell, hydrogen is discharged by

NaCl

HCl

Water

H₂S

55. Cesium oxide will be

Acidic

Weakly basic

Very strongly basic

Amphoteric

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

PCl₅

Acetylene

PH₃

SiCl₄

57. White lead is

Acidic lead carbonate

Basic lead carbonate

Basic lead hydroxide

Basic lead acetate

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

59. Setting of Plaster of Paris involves

Combination with atmospheric CO₂

Hydration to yield another hydrate

Oxidation with atmospheric oxygen

Dehydration

60. The word alkali means

Spirit

Base

Base salt

Ashes

61. 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

As compared to iron, aluminum has greater affinity for oxygen

Reaction between iron and oxygen is endothermic

62. Silicon is found in nature in the form of

Oxides

Silica or siticates

Only silicates

Sulphides

63. Nitrates of which elements give same products

Li, Na, Be

Li, Mg, Ca

Li, Na, K

All have same products

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

Na₂B₄O₇.5H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

Na₂B₄O₇

65. The principle constituent of pyrex glass is

66. The formula of Nitre is

KNO₃

NaCl

Na₂CO₃

NaNO₂

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

Zinc sulphate

Barium sulphate

Sodium sulphate

Potassium sulphate

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

N₂

O₂

CO₂

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

70. Aluminum oxide is

Amphoteric oxide

Basic oxide

Acidic oxide

It does not exists

71. Borax is a white crystalline solid and it is

Soluble only in organic solvents

Insoluble in water

More soluble in cold water

More soluble in hot water

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

Li2 CO₃

Caco₃

Na₂ CO₃

KNo₃

73. Choose the correct statement

Graphite is the hardest which lamp black is the softest

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

74. The order of alkali metals is

Li, Na, K, Rb, Cs, Fr

Fr, Li, Rb, K, Na, Cs

Na, K, Li, Rb, Fe, Cs

Li, Na, Cs, K, Rb, Fr

75. Ordinary window glass is a mixture of

Na₂SiO₃ and SiO₂

Na₂CiO₃ and CO₂

Na₂O and SiO₂

Na₂SiO₃ and CaSiO₃

Page 4 of 7

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

Colemanite

Boric acid

Calcium carbonate

Tincal

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

Aluminum oxide

Zinc oxide

Nitrogen pent oxide

Magnesium oxide

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

Hoop’s process

Serpeck’s process

Baeyer’s process

Electrolytic process

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

KOH

LiOH

CsOH

NaOH

80. Which of the most basic of the following?

As₂O₃

Al₂O₃

BaO

Na₂O

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

82. 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

CaCO₃

Ca(OH)₂

CaO

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

All above

Be(NO₃)₂

Sr(NO₃)₂

Mg(NO₃)₂

84. The oxides of beryllium are

Basic

Acidic

None of these

Amphoteric

85. 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 ionization energy increases

Their atomic size decreases

The stability of +2 oxidation state increases

Their metallic character decreases

86. Dolomite has the composition

CaCO₃.MgCO₃

KCL.MgCL₂.6H₂O

Na₃AIF₆

CaCl₂.MgCl₂.6H₂O

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

Na₂HBO₃

Na₂B₄O₇

Na₃BO₃

H₂BO₃

88. Which halide has highest melting point?

NaF

Nal

NaBr

NaCl

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

Na₂co₃

naHco₃

None

NaNo₃

90. Chile Salt peter is

Na₂SO₄

KNO₃

Na₂S₂O₃

NaNO₃

91. Plaster of Paris is a hydrate of

BaSO₄

ZnSO₄

MgSO₄

CaSO₄

92. Which of the following is a Lewis acid?

AlCl₃

NCl₃

PCl₃

AsCl₃

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

94. Microcosmic salt is

Na(NH₄). H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

K(NH₄)HPO₃. 2H₂O

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

Lime stone and silica

Lime stone and gypsum

Clay and silica

Lime stone and clay

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

It is used in dyeing industry

Its aqueous sol. Is basic in nature

Its empirical formula is KAl(SO₄). 12H₂O

On heating it melts in its water of crystallization

97. Leblanc process is employed in the manufacture of

Potash

Washing soda

Baking soda

Plaster of Paris

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

Silica

Diamond

Carbrandum

Graphite

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

Could not apply

Ca and s

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

Ionic compounds

Molecular addition compounds

Semiconductors

Molecular crystals

Page 5 of 7

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

CaCO₃

Al(OH)₃

MgCO₃

Al₂O₃

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

103. Bleaching powder is a compound having a formula

CaCO₃

CaOCl₂

CaClO

CaOCl₃

104. Alum is not used

As a mordant is dyeing

In purification of water

In tanning of leather

As an insecticide

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

Graphite

Molten NaCl

Mercury

Copper

106. Red lead is

PbO

Pb₄O₃

Pb₃O₄

PbO₂

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

Water repellent

Antifreeze

Hydraulic brakes

Lubricants

108. Which one is formula of borax?

Na₂B₄O₇. 4G₂O

Na₂B₄O₇. 10H₂O

Ca₂B₆O₁₁. 5H₂O

NaOH. B₂O₃

109. Alkali earth metals have two electrons outermost

p-orbital

f-orbital

d-orbital

s-orbital

110. What is true about reactivity of aluminum?

It reacts readily with oxygen of the air at room temperature

None is correct

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

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

111. Silicon is an important constituent of

Rocks

Amalgams

Chlorophyll

Haemoglbin

112. NaNO₃ decomposes on heating at high temperature to give

Na₂O

N₂

O₂

NO₂

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

MgO

Cr₂O₃

SnO

ZnO

114. Chrome yellow has a formula

PbO

Pb₃O₄

PbO₂

PbCrO₄

115. Ammonia may be prepared by heating ammonium chloride with

NaCl

H₂so₄

Aqueous NaoH

Water

116. The elements having highest melting point is

117. Which is formula of orthoboric acid?

H₂B₄O₇

H₆B₄O₉

HBO₂

H₃BO₃

118. Down’s cell is used to prepare

Sodium carbonate

Sodium metal

Sodium bicarbonate

Sodium hydroxide

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

120. Magnesium keeps on burning in

N₂

N₂O

N₂ as well as CO₂

CO₂

121. The halide which is not hydrolyzed is

SiF₄

CCl₄

PbCl₄

SiCl₄

122. 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

123. The chemical composition of white lead is

PbO

Na₂CO₃

Pb₃O₄

Pb(OH)₂.2PbCO₃

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

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

N₂

O₂

CO₂

Noble gases

Page 6 of 7

126. Aluminum reacts with caustic soda to form

Aluminum hydroxide

Aluminum oxide

Sodium meta-aluminate

Sodium tetra aluminate

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

They have greater atomic size

They have smaller size

They are more reactive

All

128. The oxides of born and silicon are

Natural

Basic

Amphoteric

Acidic solution

129. The chief are of aluminum is

Al₂O₃.₂H₂O

Na₃ALF₆

Al₂O₃

Al₂O₃. H₂O

130. 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

131. Which compound will show the highest lattice energy?

NaF

CsF

RbF

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

Polonium

Aluminum

Boron

Indium

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

CO₂

Br₂

NO₂

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

135. Main process for the manufacture of Na₃CO₃ is

Solvay process

Down process

Castner process

Nelson process

136. Special features of borate glass is that it is

Heat resistant

Green in colour

Low melting

Used to prepare chemical garden

137. The elements which are very abundant I earth are

B and a

All

Si and Al

Ca and Mg

138. Causticisation process is used for the preparation of

Caustic potash

Caustic soda

Slaked lime

Baryata solution

139. Which is the weakest reducing agent?

140. The formula of sodium meta borate is

Na₂B₄O₇

NaBO₃

NaBO₂

Na₃BO₃

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

Greater hardness

Lower ionization energy

Smaller ionic radii

High melting point

142. Which is the most amphoteric?

Na₂O

Al₂O₃

MgO

CaO

143. Which is the chemical formula of zircon?

H₂Mg₃(SiO₃)₄

ZrSiO₄

Al₂F₂SiO₄

Na₃AlF₆

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

VIII

IIA

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

In drying of alcohols

In drying of ammonia solution

In drying of benzene

As a general drying agent

146. Sodium conducts electricity because

It gives hydrogen with water

It has mobile electrons

It has only one electron in the outermost orbit

It is a soft alkali metal

147. The element having highest electronegativity among the following is

148. Which of the following is monovalent?

Metalloids

Metals

Alkaline earth metals

Alkali metals

149. Which of the following is most dense?

150. Born is soil has been considered micronutrient for

Soil porosity

All

Proper growth of plants

Alkalinity of soil

Page 7 of 7

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

NaCl

BaCl₂

CaCl₂

KCl

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

Graphite

Diamond

None of these

Sulphur

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

Calcium hydroxide

Calcium carbonate

Calcium bicarbonate

Calcium oxide

154. Setting of cement is an

Exothermic reaction

None

Endothermic reaction

Neither exothermic nor endothermic

155. The formula of china clay is

Al₂O₃. SiF₄

Al₂O₃. 2H₂O

Al₂O₃

Al₂O₃. 2SiO₂. 2H₂O

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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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Malik Tahir

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