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ECAT Chemistry Solids Online Test

Maan AliLast Updated: April 19, 2025

Chemistry Solids MCQS Online Test

ECAT Chemistry Solids Chapter Online Test

Total Questions:	150
Time Allowed:	60 Minutes
Total Marks:	150
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Chemistry Solids Test

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Page 1 of 6

Chemistry

1. Correct order of intermolecular forces

Gas = liquid = solid

Gas < liquid < solid

Liquid < gas < solid

Gas < liquid < solid

2. Isomorphic substance have

Different physical and same chemical properties

Same physical and difference chemical properties

Same physical and chemical properties

Different physical and chemical properties

3. An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of compound is

C₃H₅O₂

C₆H₁₀O₄

C₄H₁₀O₂

C₃H₁₀O₂

4. Which of the following substances is not amorphous?

Rubber

Glass

Polymer

Ag NO₃

5. The mass of one mole of electron is

0.55 mg

1.008 mg

0.104 mg

1.673 mg

6. Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C?

B evaporates more readily than A

A and B evaporates at the same rate

A evaporates more readily than C

B evaporates less readily than C

7. 3.2 g of oxygen (At. Wt. = 16) and 0.2 g of hydrogen (At. Wt. = 1) are placed in a 1.12 L flask at 0°C. The total pressure of the gas mixture will be

4 atm

1 atm

3 atm

2 atm

8. Gooch crucible is used for the filtration of precipitates having

Low temperature

High ignition temperature

High solubility

High concentration

9. Distribution law is employed in which one of the following

Chromatography

All

Crystallization

Solvent extraction

10. Amorphous substances possess

Definite heat of fusion

Sharp B.P.

Sharp melting points

No definite heat of fusion

11. The material possessing superconducting properties is

Yb Ba₂Cu₂O₈

Y Ba₂Cu₃O₇

Y B₂Cu₃O₇

Hg Be₂Ca₂Cu₂O₈

12. At constant temperature, the pressure of an ideal gas is doubled, its density becomes

Double

Half

Same

None

13. Bragg’s law is given by equation

nλ = 2 θ sin θ

nλ = 1/2d sin θ

2nλ = d sin θ

nλ = 2 d sin θ

14. The total number of lattice arrangements in different crystal system is

3.0

8.0

7.0

15. When one of the following statements is wrong for gases?

Confined gas exerts uniform pressure on the walls of its container in all directions

Volume of the gas is equal to volume of container confining the gas

Gases do not have a definite shape and volume

Mass of gas cannot be determined by weighing a container in which it is enclosed

16. Which of the following does not represent a type of crystal system?

Triclinic

Monoclinic

Isotropical

Rhombohedral

17. Which of the following is isotropic

Mercury

Borax

Brass

Graphite

18. Ionic solids are characterized by

High vapour pressures

Low melting points

Good conductivity in solid state

Solubility in polar solvents

19. The introduction of Kelvin scale in thermometry is according to

Dalton’s law

Graham’s law

Charles’ law

Boyle’s law

20. Formation of a cation is?

None

Redox

Oxidation

Reduction

21. Coordination number of Zn and ZnS (Zinc blends) is

None of these

22. Which of the following substance is amorphous in nature?

Graphite

Plastic

Kcl

Sugar

23. Solvents of covalent compounds include all but

Water

Alcohol

Petrol

Tetra chloromethane

24. Solvent extraction is mostly applied to separate

Organic compounds

Both A and B

None of these

Inorganic compounds

25. Isomorphic substances have

Different physical and same chemical properties

Same physical and different chemical properties

Different physical and chemical properties

Same physical and chemical properties

Page 2 of 6

26. The top of funnel stem should touch the side of the beaker because

The filtrate is quick

Filtrate runs down without crystals

This gives bigger size crystals

This gives medium size crystals

27. The most efficient solvent extraction method is by using

Repeated extraction and small portion of solvent

Single extraction and small portion of solvent

Repeated extraction and large portion of solvent

Single extraction and large portion of solvent

28. In case of elements the polymorphism is called

Isomorphism

Crystalline forms

Isotopic form

Allotropy

29. Van der Waal’s forces exist in

Non-polar

Covalent

Polar compounds

All types of atoms and molecules

30. The phenomenon in which a single substance exist in two or more crystalline forms is called

Polymorphism

Anisotropy

Isomorphism

Allotropy

31. The crystal structure having face centered cubic arrangement is

NaCl

CsCl

BaCl₂

CuCl

32. Which solids are called true solids?

Vitreous

Metallic

Amorphous

Crystalline

33. Wt. of 112 ml of oxygen at STP on liquefaction would be

0.16 g

0.64 g

0.96 g

0.32 g

34. The insoluble impurities in the saturated solution are removed by

Both A & B

Normal filter paper

Fluted filter paper

None

35. Particles that most effects material properties

Valence electrons

Neutrons

Protons

Electrons

36. Which one is not usually used for the crystallization?

Sulphuric acid

Chloroform

Acetone

Acetic acid

37. The example of hexagonal system is

Sulphur

Diamond

Sugar

Graphite

38. Poor conductors of electricity is a characteristic of

Metallic compounds

Diatic bonds

Covalent compounds

Ionic compounds

39. The beaker contains slurry of ice and water, the three thermometers Fahrenheit, Kelvin and centigrade placed in it. The thermometers are represented as A, B and C respectively. On which thermometer the lowest reading will be?

A and C have same reading and are less then B

40. The total number of protons in 10 g of calcium carbonate in (N₀ = 6.023 x 10²³)

3.0115 x 10 ²⁴

1.5057 x 10 ²⁴

4.0956 x 10 ²⁴

2.0478 x 10 ²⁴

41. Amorphous solids

Have sharp melting point

Undergo clean cleave when cut with knife

Can possess small regions of orderly arrangement of atoms

Have perfect arrangement of atoms

42. Isotopes differ in

Properties which depend upon mass

Chemical properties

The extent to which they may be affected in electron magnetic field

Arrangement of electrons in orbitals

43. Which of the following statements about graphite is not true?

The coordination number of carbon atoms is 4

The carbon atoms use only three of their four outer electrons for covalent bonding

The carbon atoms are arranged layers

The layers in graphite are attracted to each other by weak forces

44. When the temperature is raised, the viscosity of the liquid decreases. This is because of

Decreased covalent and hydrogen bond forces

Increased attraction between the molecules

Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

45. Crystalline solids can be identified easily by their

All of these

Transition temperature

Sharp m.P

Definite geometry

46. A bottle of copper (II) oxide has been contaminated with some solid, NaCl, How can NaCl be removed from the Copper (II) oxide?

Add dilute acid to the mixture and filter

Heat the mixture and allow it to cool

Place the mixture in a separating funnel

Add water to the mixture and filter

47. Which of the following are more temperature sensitive?

Liquid crystals

Ionic crystals

Solid crystals

None of these

48. Which one of the following pair of atoms is most likely to from an ionic bond?

Na and F

O and F

N and F

C and F

49. The phenomenon in which a compound exists in two or more crystalline forms is called

Isomorphism

Allotropy

Anisotropy

Polymorphism

50. Ice is ________ crystal

Metallic

Ionic

Covalent

Molecular

Page 3 of 6

51. In crystal structure of sodium chloride, the arrangement of Cl ions is

Both fcc and bcc

None of these

Fcc

Bcc

52. The molar volume of CO₂ is maximum at

127°C and 1 atm

0°C and 2 atm

S.T.P (0°C and 1 atm)

273°C and 2 atm

53. ‘x’ grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of ‘x’ in grams?

150

200

54. What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit in Van der Waals equation? (a = 0.17, b = 0.03711)

9.333 atm

10.33 atm

9.74 atm

9.2 atm

55. Air at sea level is dense. This is a practical application of

Avogadro’s law

Boyle’s law

Dalton’s law

Charles’ law

56. Which of the following techniques is a type paper chromatography in which solvent is in a pool at the bottom of the vessel?

Descending paper chromatography

Liquid gas chromatography

Liquid solid chromatography

Ascending paper chromatography

57. The coordination number 8:8 is found in the arrangement of

NaCl type structure

CsCl type structure

AB₂ type ionic compound

ZnS type structure

58. A malleable solid is one which can be

Melted easily

Converted into sheets

All of these

Converted into wires

59. Consider the physical properties of the gases. Which of the following statements about particles of gasses is incorrect? The particles are

Orderly arranged

Having wide spaces

Causing pressure

Randomly moving

60. Which of the following is an example of body centered cube?

Magneisum

Zinc

Copper

Sodium

61. Triple point of water is

373 K

193 K

273 K

203 K

62. For c coordination number of four, anion sits at the center of ________ where corners are occupied by cations

Cube

Triangle

Octahedron

Tetrahedron

63. Which is distilled first?

Liquid CO₂

Liquid O₂

Liquid H₂

Liquid N₂

64. A solution of 10 mL of M/10 FeSO₄ was titrated with KMnO₄ solution in acidic medium, the amount of KMnO₄ used will be

10 mL of 0.1 M

5 mL of 0.1 M

10 mL of 0.5 M

10 mL of 0.02 M

65. Two moles of an ideal gas at 1 atm are compressed to 2 atm at 273 K. The enthalpy change for the process is

1 liter atm

Zero

3 liter atm

2 liter atm

66. The ratio of most probable velocity to that of average velocity is

2/√π

2/π

π/2

√π/2

67. The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behavior is a characteristic of substance forming

Allotropic crystal

Isomorphous crystals

Liquid Crystals

Isomeric crystals

68. What is the relative rate of effusion of CO and CO₂?

Both diffused at the same time

CO₂ is 1.25 times faster than CO

CO is 3.75 times faster than CO₂

CO is 1.25 times faster than CO₂

69. Which is trigonal crystal?

NaNO₃

MgSO₄

All

CaSO₄.2H₂O

70. The surface formed by the breakage of a crystal is called _________ plane.

Unit

Crystal

Cleavage

None

71. 50dm³ of CO is burnt completely according to reaction 2CO + O₂ – 2CO₂ Choose the correct statement

Volume of O₂ required is 50 dm³

Volume of CO₂ formed is 60 dm³

Volume of CO₂ formed is 25 dm³

Volume of O₂ required is 25 dm³

72. Which of the following statements about amorphous solids is incorrect?

They melt over a range of temperature

They are anisotropic

There are rigid and in-compressible

There is no orderly arrangement of particles

73. Crystal can be classified in to _______ basic crystal habits

74. Pressure remaining constant at which temperature the volume of a gas will become twice o what it is at 0°C

546 K

200 °C

546 °C

0 K

75. Which of the following contain maximum number of atoms?

44.8 dm3 CO₂ at S.T.P

5.0 moles of SO₂

20 moles of S8

6 moles of S

Page 4 of 6

76. A semiconductor of Ge can be made p-type by adding

Divalent impurity

Tetravalent

Trivalent impurity

Pentavalent impurity

77. Potassium crystallizes with a

Triclinic

Ortho rhombic lattice

Cubic lattice

Orthogonal lattice

78. Gases deviate from ideal behavior at high pressure. Which of the following is correct for non – ideality?

At high pressure, the collisions between the gas molecules are increased manifold

A high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

At high pressure, the gas molecules move in one direction only

79. What will be the external pressure at which water may boil at 120°C?

100 mm of Hg

700 mm of Hg

1489 mm of Hg

790 mm of Hg

80. The number of atoms contained in 11.2 L of SO₂ at S.T.P. are

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

3/2 x 6.02 x 10²³

81. Under what conditions real gases deviate from ideal behavior

Low temperature

High pressure

High temperature

Both b and c

82. Which of the following pairs do not form a dative covalent bond to each other?

H₂O and H⁺

NH₃ and H⁺

CH₄ and AlCl₃

NH₃ and BF₃

83. Super conductors are derived from compounds of

Transition elements

Actinides

p-block elements

Lanthanides

84. Which of the following is a pseudo solid?

Glass

CaF₂

NaCl

All these

85. In a crystal a ≠ b ≠ c, a = ϒ = 90° and β ≠ 90°. It is

Rhombic

Monoclinic

Trigonal

Tetragonal

86. Crystalline solids can be identified easily from their

Colour

Sharp melting point

Definite geometry

Transition temperature

87. How many allotropic forms are present in carbon?

Three

Two

Five

Four

88. Hydrogen diffuses six times faster than gas A. The molar mass gas of gas A is

89. A solid may be made up of

Molecules

A, B and C

Ions

Atoms

90. To prepare the medium sized crystal the hot filtrate is cooled

None

Fast

Moderately

Slowly

91. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

44 liter

2.24 liter

2.4 liter

22.4 liter

92. What is the concentration of nitrate ions, if equal volumes of 0.1 M AgNO₃ and 0.1 M NaCl are mixed together?

0.25 M

0.05 M

0.1 M

0.2 M

93. Which one is not the partial pressure of oxygen in air

159 g/Cm²

159 mm Hg.

159 torr

159 g/m³

94. Which of the following crystal does not possess the cubic closed packed arrangement?

HgS

Agl

Csl

Cul

95. The volume in liters of CO₂ liberated at STP when 10 grams of 90% pure limestone is heated completely is

20.16

2.24

2.016

22.4

96. If the four tubes of a car are filled to the same pressure with N₂, O₂, H₂ and helium separately, then which one will be filled first

O₂

H₂

N₂

97. In NaCl type structure, the coordination numbers of cation and anions are

6 and 6

6 and 4

8 and 4

4 and 4

98. Among solids, the highest melting point is exhibited by

Molecular solids

Ionic solids

Covalent solids

Pseudo solids

99. How many Cl¯ ions are there around Na⁺ ion in NaCl crystal?

100. At STP, a container has 1 mole of Ar, 2 moles of CO₂, 3 moles of O₂ and 4 moles of N₂, Without changing the total pressure if one mole of O₂ is removed, the partial pressure of O₂

Is changed by about 26%

Is halved

Is unchanged

Change by 33%

Page 5 of 6

101. Which one is not postulated in the kinetic molecular theory among the followings?

All molecular collisions are elastic

Molecules of all the gases have same size and same mass

Molecules are in chaotic motion

The volume of the molecules is negligible as compared to volume occupied by the gas

102. Glass is a

Micro-crystalline solid

Super-cooled liquid

None of these

Gel

103. Imagine a man is sitting in a room. The room is closed from all sides, no entry, no exit of any gas. If the room expands suddenly then

He will feel warmth

His blood pressure will increase

He will feel cool

There will be no change in the internal environment of the room

104. In forming an ionic bond in potassium fluoride, the potassium ion

Gets a double positive charge

Gets a double negative charge

Gets a single negative charge

Gets a single positive charge

105. If rate of diffusion of A is 5 times that of B, what will be the density ratio of A and B?

1/5

1/25

106. Fluted filter paper is used for

Filtering the hot saturated solution

To avoid premature crystallization of the solute

To dissolve large amount of substance at its boiling point

Increasing the rate of filtration

107. The weight of one molecule of a compound C₆₀H₁₂₂ is

3.72 x 10¯²³ g

1.4 x 10¯²¹ g

1.3 x 10¯²⁰ g

5.01 x 10¯²¹ g

108. Which forms metallic crystals?

NH₄Cl

NaCl

SO₂

109. Current strength measure by electrometer by each type of ions in mass spectrometry shows?

Number of isotopes

Relative abundance

Charge

Mass

110. Mean distance between atoms in the range of

0.25 nm

2.5 nm

25 nm

0.025 nm

111. Which of the following statements is (are correct)?

A metal that crystallizes in BCC structure has coordination number equal to 12

The coordination number of each type of ion in CsCl crystal is 8.

None of these

A unit cell of an ionic crystal shares some of its ions with other unit cells.

112. If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of substance will

Decrease twice

Increase two fold

Be a function of the molecular mass of substance

Remains unchanged

113. In which process solid phase and vapour phase are directly involved?

Condensation

Filtration

Sublimation

Vaporization

114. Crystals can be classified into

3 crystal systems

4 crystal systems

7 crystal systems

14 crystal systems

115. The rate of diffusion of a gas is proportional to

None of these

√P/d

P/d

P/√d

116. The increasing vapour caused by heating a liquid is due to

Increase in potential energy of molecules

Decrease of surface tension

Increase of K.E of molecules

Increase of intermolecular interactions

117. Which of the following has least mass?

1 mole of S

7.0 g of Ag.

3 x 10²³ atoms of C

2 gram atom of nitrogen

118. Number of atoms in 558.5 g of Fe (At. Mass of Fe = 55.85 g mole¯¹) is

Half that in 8 g of He

Twice that in 60 g carbon

6.022 x 10²²

558.5 x 6.022 x 10²³

119. In diamond, the carbon atoms are arranged in a

Hexagonal manner

Tetrahedral manner

Altahydral manner

Square planner manner

120. The major binding force of diamond, silicon and quartz is

Electrical attraction

Covalent bond

Electrostatic force

Non covalent bond force

121. Repeatable entity of a crystal structure is known as

Unit cell

Crystal

Miller indices

Lattice

122. The allotropic forms of an element are called

Isoelectronic

Cleavage

Unit Cell

Allotropes

123. The volume occupied by 1.4g of N₂ at S.T.P is

112 cm³

1.12 dm³

22.4 dm³

2.24 dm³

124. Which of the following equations represents the 2nd ionization energy of Na?

Na(s) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + e¯

Na(s) → N²⁺ (g) + 2e¯

Na(g) → N²⁺ (g) + +¯

125. The existence of a substance in more than one solid modification is known as

None of these

Isomorphism

Polymorphism

Amorphism

Page 6 of 6

126. 100 g of CaCO₃ is treated with 1 liter of 1 NHCl. What would be the weight of CO₂ liberated after the completion of the reaction?

5.5 g

22 g

33 g

11 g

127. The body centered cubic arrangement is found in the crystal of

AgBr

CuBr

CsBr

NH₄Br

128. The reaction 4NH₃ + 3O₂ → 2N₂ + 6H₂O indicates that

One mole of NH₃ will produce 6 moles of N₂

For the complete reaction of 2 moles of NH₃ 40g of O₂ are required

One mole of NH₃ will produce ½ mole of N₂

For the complete reaction of 2 mole of NH₃ 20g of O₂ are required

129. In which of the following compounds H – bonding is not present?

Ammonia

Ether

Ethanol

Water

130. The ratio of close packed atoms to tetrahedral holes in cubic close packing is

2 : 1

1 : 1

1 : 2

1 : 3

131. Amorphous substance posses

No definite heat of fusion

No sharp melting points

No definite geometry

All of these

132. A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centered. The formula of the compound is

XY₂

X₃Y

XT₃

133. A real gas most closely approaches the behavior of an ideal gas at

1 atm, and 273 K

15 tm, and 500 K

0.5 atm, and 500 K

15 atm, and 200 K

134. The relative atomic mass of chlorine is 35.5. What is the m ass of 2 moles of chlorine gas?

71g

142g

18.75g

35.5g

135. Half atmospheric pressure is

101.325 Pa

400 torr

8.5 Pounds

50 662 Pa

136. The molecules of air don’t settle down. The is due to

Non-polar nature of gases

Different molar mass

Elastic collisions of gas molecules

Pressure of dust particles in air

137. In which one of the following does the central atom not possess an ‘octet’ in its outer shell?

H₂O

BH₃

CH₄

NH₃

138. In a cubic lattice, a unit cell is shared equally by how many unit cells?

139. The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is

22.4 liters

11.2 liters

2.24 liters

1 liter

140. The M.P of ice at Kelvin scale is 237K° and B.P of water is 373 K. This is a known fact that the molar volumes of different gases at S.T.P are

Much larger than the molar volumes of liquids and solids

Little bit less than the molar volumes of solids

Little bit greater than the molar volumes of liquid

About the same as the molar volumes of liquids

141. Which of the following metal oxides is anti-ferromagnetic in nature?

TiO₂

MnO₂

NO₂

CrO₂

142. The deviation of a gas from ideal behavior is maximum at

-10°C and 2.0 atm

100°C and 2.0 atm

0°C and 2.0 atm

-10°C and 5.0 atm

143. Simple molecules or giant macromolecules are examples of

Covalent bonds

Metallic bonds

Ionic compounds

Diatic bond

144. The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals. (R = 2 cal mol¯¹ K¯¹)

4800

1524

4400

3200

145. a ≠ b ≠ c, ∞ ≠ β ≠ r ≠ 90 is representation of

Monoclimic

Trigonal

Mexagonal

Triclimic

146. In the equation PV = nRT which one cannot be numerically equal to R

8.31 x 10⁷ dynes Cm K¯¹ mol¯¹

8.31 JK¯¹ mol¯¹

8.31 L atm K¯¹ mol¯¹

8.31 x 10⁷ erg³ K¯¹ mol¯¹

147. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is:

Three

Two

Five

Four

148. Graphite is a good conductor of electricity due to the presence of ________.

Anions

Free valence electrons

Ione pair of electrons

Cations

149. The following statements contained in a student’s laboratory report is a conclusion

Colour of the gas is greenish yellow

A gas is liberated

The gas is chlorine

Oxide of the gas is strongly acidic

150. When the following reaction equations is properly balanced, the number of moles of O₂ will be
C₃H₈ + O₂ → CO₂ + H₂O

3 moles

1.5 moles

3.5 moles

10 moles

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Maan AliLast Updated: April 19, 2025

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ECAT Chemistry Solids Online Test

Chemistry Solids MCQS Online Test

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Chemistry Solids MCQS Online Test

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