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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. Microcosmic salt is

Na(NH₄). H₂O

K(NH₄)HPO₃. 2H₂O

Na(NH₄)HPO₄.4H₂O

HPO₄.4H₂O

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

Calcium carbonate

Boric acid

Colemanite

Tincal

3. Down’s cell is used to prepare

Sodium carbonate

Sodium hydroxide

Sodium bicarbonate

Sodium metal

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

Sodium sulphate

Potassium sulphate

Barium sulphate

Zinc sulphate

5. 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

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

IIA

VIII

7. Washing soda has formula

Na₂CO₃. 7H₂O

Na₂CO₃. 3H₂O

Na₂CO₃. 10H₂O

Na₂CO₃.

8. The formula of Nitre is

NaCl

Na₂CO₃

NaNO₂

KNO₃

9. Main process for the manufacture of Na₃CO₃ is

Castner process

Down process

Nelson process

Solvay process

10. AlCl₃ exist as dimmer because

Incomplete p-subshell

Al has larger radius

High charge in nucleus

Al has greater ionization potential

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

Polonium

Gallainm

Aluminum

Thallium

12. Silicon is an important constituent of

Amalgams

Chlorophyll

Haemoglbin

Rocks

13. The aqueous solution of potash alum is

Neutral

Acidic

Basic

None of these

14. Ammonia may be prepared by heating ammonium chloride with

Aqueous NaoH

H₂so₄

Water

NaCl

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

Lower ionization energy

Greater hardness

High melting point

Smaller ionic radii

16. What is true about physical state of borax?

White crystalline solid

White amorphous solid

White crystalline sublime solid

None of these

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

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

Molecular crystals

Ionic compounds

Molecular addition compounds

Semiconductors

19. Which halide has highest melting point?

Nal

NaBr

NaF

NaCl

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

None

naHco₃

Na₂co₃

NaNo₃

21. Setting of Plaster of Paris involves

Dehydration

Combination with atmospheric CO₂

Hydration to yield another hydrate

Oxidation with atmospheric oxygen

22. Aluminum oxide is

Acidic oxide

Basic oxide

It does not exists

Amphoteric oxide

23. The chief are of aluminum is

Al₂O₃

Al₂O₃.₂H₂O

Al₂O₃. H₂O

Na₃ALF₆

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

Low ionization energy

Low atomic volume

Low electro negativity

Low density

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

Page 2 of 7

26. Chile Salt peter is

Na₂SO₄

KNO₃

Na₂S₂O₃

NaNO₃

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

28. The chemical composition of white lead is

Pb(OH)₂.2PbCO₃

Na₂CO₃

Pb₃O₄

PbO

29. Which one is formula of borax?

Ca₂B₆O₁₁. 5H₂O

Na₂B₄O₇. 10H₂O

NaOH. B₂O₃

Na₂B₄O₇. 4G₂O

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

Graphite

Molten NaCl

Copper

Mercury

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

KOH

LiOH

CsOH

NaOH

32. Born is soil has been considered micronutrient for

Proper growth of plants

Soil porosity

All

Alkalinity of soil

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

KCl

NaCl

CaCl₂

BaCl₂

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

Calcium carbonate

Calcium oxide

Calcium hydroxide

Calcium bicarbonate

35. Which compound will show the highest lattice energy?

CsF

NaF

RbF

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

Cl₂

O₂

Cl¯

OCl¯

37. Ordinary window glass is a mixture of

Na₂CiO₃ and CO₂

Na₂O and SiO₂

Na₂SiO₃ and SiO₂

Na₂SiO₃ and CaSiO₃

38. Nitrates of which elements give same products

Li, Mg, Ca

Li, Na, K

All have same products

Li, Na, Be

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

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

To remove air bubbles from molten metal

As nitro meter

As insulator

To produce alloy

41. 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

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

1s2 2s2 2p4

1s2 2s2 2p3

1s2 2s2 2p6 3s2 3p1

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

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

They have greater atomic size

They have smaller size

All

They are more reactive

44. The oxides of beryllium are

None of these

Basic

Amphoteric

Acidic

45. The formula of sodium meta borate is

NaBO₃

Na₂B₄O₇

Na₃BO₃

NaBO₂

46. Which is the chemical formula of mica?

K2HAL(SiO₄)₃

NaKSiO₄. 10H₂O

KH₂Al₃(SiO₄)₃

NaAlSiO₄. 3H₂O

47. 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

CaO

CaCO₃

Ca(OH)₂

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

Could not apply

Ca and s

49. Chrome yellow has a formula

PbCrO₄

Pb₃O₄

PbO₂

PbO

50. Setting of cement is an

Exothermic reaction

Neither exothermic nor endothermic

None

Endothermic reaction

Page 3 of 7

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

Na₂B₄O₇.5H₂O

Na₂B₄O₇

Na₂B₃O₆. 10H₂O

Na₂B₄O₇. 10H₂O

52. Plaster of Paris hardens by

Changing into CaCO₃

Giving off CO₂

Giving out water

Combining with water

53. A pseudo solid is

Rock salt

Glass

CaCO₃

Diamond

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

Boron

Polonium

Aluminum

Indium

55. Causticisation process is used for the preparation of

Caustic potash

Caustic soda

Baryata solution

Slaked lime

56. Which is the formula of Chili Salt Peter?

KNo₃

K₂SO₄

NaNo₃

Na₂So₄

57. The chemical formula of bauxite is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

None of these

Al₂O₃

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

It has delocalized mobile electron

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

Carbon atoms have covalent bonds

Carbon atoms of each plane have sp²

59. Silicon is found in nature in the form of

Silica or siticates

Only silicates

Sulphides

Oxides

60. Choose the correct statement

Diamond is the hardest and coke is the softest

Graphite is the hardest which lamp black is the softest

Coal is the hardest and coke is the softest

Diamond is the hardest and graphite is the softest

61. Potassium is kept in

Water

Kerosene

Ammonia

Alcohol

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

63. Anodizing of Al is said when

Aluminum coated electrically with aluminum oxide

Aluminum obtained at anode

Aluminum allay containing 95% Al

Aluminum prepared electrolytically

64. The oxides of born and silicon are

Basic

Amphoteric

Acidic solution

Natural

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

66. Which of the most basic of the following?

BaO

As₂O₃

Na₂O

Al₂O₃

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

CaCO₃

MgCO₃

Al(OH)₃

Al₂O₃

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

Magnesium oxide

Zinc oxide

Nitrogen pent oxide

Aluminum oxide

69. Chile saltpeter has the chemical formula

KNO₃

Na₂CO₃. H₂O

Na₂B₄O₇

NaNO₃

70. The elements having highest melting point is

71. Boric acid cannot be used

For washing of eyes

An antiseptic medicine

For enamels and glazes

In soda bottles

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

Sodium sulphate

Barium sulphate

Zinc sulphate

Potassium sulphate

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

Its empirical formula is KAl(SO₄). 12H₂O

It is used in dyeing industry

Its aqueous sol. Is basic in nature

On heating it melts in its water of crystallization

74. Which of the following is monovalent?

Alkaline earth metals

Metals

Alkali metals

Metalloids

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

Page 4 of 7

76. 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

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

None is correct

77. The formula of china clay is

Al₂O₃. 2H₂O

Al₂O₃. SiF₄

Al₂O₃. 2SiO₂. 2H₂O

Al₂O₃

78. 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

79. Which is the most amphoteric?

Al₂O₃

MgO

Na₂O

CaO

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

81. H₃BO₃ is a

None of these

Monobasic acid

Tribasic acid

Dibasic acid

82. Galena is an ore of

Tin

Gallium

Germanium

Lead

83. The process of aluminum extraction is called

Haber process

Contact process

Hall process

Termite process

84. Alkali earth metals have two electrons outermost

d-orbital

p-orbital

s-orbital

f-orbital

85. NaNO₃ decomposes on heating at high temperature to give

NO₂

Na₂O

O₂

N₂

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

Mica

Cryolite

Feldspar

Fluorspar

87. Plaster of Paris is a hydrate of

BaSO₄

CaSO₄

ZnSO₄

MgSO₄

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

Br₂

NO₂

CO₂

89. Aluminum reacts with caustic soda to form

Sodium meta-aluminate

Sodium tetra aluminate

Aluminum oxide

Aluminum hydroxide

90. The order of alkali metals is

Fr, Li, Rb, K, Na, Cs

Li, Na, K, Rb, Cs, Fr

Li, Na, Cs, K, Rb, Fr

Na, K, Li, Rb, Fe, Cs

91. Which is formula of orthoboric acid?

H₆B₄O₉

H₂B₄O₇

H₃BO₃

HBO₂

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

Electrolytic process

Baeyer’s process

Hoop’s process

Serpeck’s process

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

None of these

High nuclear charge

High ionization potential

High nuclear charge and ionization

94. 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

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

Both d – and f –

s – or – p

d – only

f – only

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

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

CO2 is an independent molecule while SiO2 has network covalent structure

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

Remain constant

Do not show definite trend

Decrease

Increase

98. Red lead is

Pb₃O₄

PbO

Pb₄O₃

PbO₂

99. Bleaching powder is a compound having a formula

CaCO₃

CaOCl₂

CaOCl₃

CaClO

100. Portland cement is manufactured by using

Limestone, gypsum and sand

Limestone, clay and sand

Limestone, clay and gypsum

Limestone, gypsum and alumina

Page 5 of 7

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

Acetylene

PH₃

SiCl₄

PCl₅

102. 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

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

Lubricants

Water repellent

Antifreeze

Hydraulic brakes

104. Dolomite has the composition

Na₃AIF₆

KCL.MgCL₂.6H₂O

CaCO₃.MgCO₃

CaCl₂.MgCl₂.6H₂O

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

I₂

NH₄Cl

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

O₂

CO₂

N₂

107. Sodium metal cannot be stored under

Alcohol

Kerosene oil

Benzene

Toluene

108. The element having highest electronegativity among the following is

109. In diaphragm cell, hydrogen is discharged by

Water

NaCl

HCl

H₂S

110. Sodium reacts with water more vigorously than lithium because

It is more electropositive

It has higher atomic weight

It is a metal

It is more electronegative

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

Magnesium and potassium

Magnesium and sodium

Magnesium and copper

Magnesium and barium

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

Aluminum

Copper

Iron

Zinc

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

Na₂ CO₃

Li2 CO₃

KNo₃

Caco₃

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

CsF

NaF

LiF

Csl

115. The formula of calcium cyanamide is

CaCHNH₂

Ca(CN)₂

CaNCN

CaC₂N

116. Mica and bauxite are ores of

117. Sodium conducts electricity because

It gives hydrogen with water

It has mobile electrons

It is a soft alkali metal

It has only one electron in the outermost orbit

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

119. The word alkali means

Base salt

Base

Ashes

Spirit

120. Which of the following is most dense?

121. The elements which belong to group IIIA are called

F – block

P – block

D – block

S – block

122. Borax is a white crystalline solid and it is

Insoluble in water

More soluble in cold water

Soluble only in organic solvents

More soluble in hot water

123. 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

First group

Fifth group

124. The halide which is not hydrolyzed is

CCl₄

SiCl₄

PbCl₄

SiF₄

125. What is true about solubility of orthoboric acid?

Sparingly soluble in cold water but readily soluble in hot water

Sparingly soluble in cold water at all temperatures

Readily soluble in cold water

Highly soluble in water at all temperatures.

Page 6 of 7

126. Special features of borate glass is that it is

Heat resistant

Used to prepare chemical garden

Green in colour

Low melting

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

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

All above

Be(NO₃)₂

Mg(NO₃)₂

Sr(NO₃)₂

129. Cesium oxide will be

Amphoteric

Weakly basic

Acidic

Very strongly basic

130. Aluminum can jam radar due to

It is not true

It is a conductor of heat

It is a good reflector of radiant energy

It is a conductor of electricity

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

Lime stone and gypsum

Clay and silica

Lime stone and clay

Lime stone and silica

132. The elements which are very abundant I earth are

Ca and Mg

B and a

All

Si and Al

133. Magnesium keeps on burning in

N₂ as well as CO₂

N₂

CO₂

N₂O

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

N₂

Noble gases

CO₂

O₂

135. Alkali metal hydroxides are stable to heat except

LiOH

NaOH

RbOH

KOH

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

Na₂B₄O₇

Na₂HBO₃

Na₃BO₃

H₂BO₃

137. Leblanc process is employed in the manufacture of

Washing soda

Plaster of Paris

Baking soda

Potash

138. 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

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

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

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

142. Metallic luster exhibited by Na can be explained by

Existence of body centered cubic lattice

Oscillation of loose electrons

Diffusion of sodium ions

Excitation of free protons

143. Which is the weakest reducing agent?

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

Graphite

Diamond

Silica

Carbrandum

145. The principle constituent of pyrex glass is

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

Sulphur

None of these

Diamond

Graphite

147. Which is the chemical formula of zircon?

ZrSiO₄

H₂Mg₃(SiO₃)₄

Na₃AlF₆

Al₂F₂SiO₄

148. White lead is

Acidic lead carbonate

Basic lead acetate

Basic lead hydroxide

Basic lead carbonate

149. Which of the following is a Lewis acid?

PCl₃

NCl₃

AsCl₃

AlCl₃

150. BF₃ acts as acid according to the concept of

Lewis

Bronsted

Arrhenius

None

Page 7 of 7

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

Irregular tetrahedron

None of these

Square planar

Square pyramid (carbon at apex)

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

Electropositivity

Atomic volume

Atomic radii

All above

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

154. Alum is not used

In tanning of leather

As an insecticide

In purification of water

As a mordant is dyeing

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

ZnO

SnO

MgO

Cr₂O₃

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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

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