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

Pressure of dust particles in air

Different molar mass

Elastic collisions of gas molecules

Non-polar nature of gases

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

3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

3. Crystalline solids can be identified easily by their

Sharp m.P

Transition temperature

Definite geometry

All of these

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

Bcc

Fcc

Both fcc and bcc

None of these

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

0.5 atm, and 500 K

1 atm, and 273 K

15 atm, and 200 K

15 tm, and 500 K

6. Solvents of covalent compounds include all but

Tetra chloromethane

Water

Petrol

Alcohol

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

CO₂ is 1.25 times faster than CO

Both diffused at the same time

CO is 1.25 times faster than CO₂

CO is 3.75 times faster than CO₂

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

18.75g

142g

71g

35.5g

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

Magneisum

Sodium

Zinc

Copper

10. The mass of one mole of electron is

0.55 mg

1.673 mg

1.008 mg

0.104 mg

11. Poor conductors of electricity is a characteristic of

Diatic bonds

Ionic compounds

Metallic compounds

Covalent compounds

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

The carbon atoms are arranged layers

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

The coordination number of carbon atoms is 4

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

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

Gets a double negative charge

Gets a double positive charge

Gets a single negative charge

Gets a single positive charge

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

8.31 x 10⁷ erg³ K¯¹ mol¯¹

8.31 x 10⁷ dynes Cm K¯¹ mol¯¹

8.31 JK¯¹ mol¯¹

8.31 L atm K¯¹ mol¯¹

15. 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

Isomorphous crystals

Allotropic crystal

Liquid Crystals

Isomeric crystals

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

O and F

N and F

C and F

Na and F

17. Which of the following substances is not amorphous?

Ag NO₃

Rubber

Polymer

Glass

18. 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

19. Solvent extraction is mostly applied to separate

Both A and B

None of these

Organic compounds

Inorganic compounds

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

None of these

21. 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?

22 g

11 g

5.5 g

33 g

22. Amorphous solids

Have perfect arrangement of atoms

Undergo clean cleave when cut with knife

Have sharp melting point

Can possess small regions of orderly arrangement of atoms

23. Under what conditions real gases deviate from ideal behavior

High pressure

Low temperature

High temperature

Both b and c

24. 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

25. Formation of a cation is?

Redox

None

Reduction

Oxidation

Page 2 of 6

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

20.16

2.016

2.24

22.4

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

Graham’s law

Dalton’s law

Boyle’s law

Charles’ law

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

Same

Double

Half

None

29. Which of the following has least mass?

7.0 g of Ag.

1 mole of S

2 gram atom of nitrogen

3 x 10²³ atoms of C

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

A evaporates more readily than C

B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

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

NH₃ and H⁺

H₂O and H⁺

CH₄ and AlCl₃

NH₃ and BF₃

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

Heat the mixture and allow it to cool

Place the mixture in a separating funnel

Add dilute acid to the mixture and filter

Add water to the mixture and filter

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

Tetravalent

Pentavalent impurity

Divalent impurity

Trivalent impurity

34. The most efficient solvent extraction method is by using

Single extraction and large portion of solvent

Repeated extraction and small portion of solvent

Single extraction and small portion of solvent

Repeated extraction and large portion of solvent

35. Which of the following are more temperature sensitive?

Solid crystals

Ionic crystals

None of these

Liquid crystals

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

Square planner manner

Altahydral manner

Tetrahedral manner

Hexagonal manner

37. Correct order of intermolecular forces

Gas = liquid = solid

Gas < liquid < solid

Liquid < gas < solid

Gas < liquid < solid

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

Acetone

Chloroform

Acetic acid

Sulphuric acid

39. Triple point of water is

373 K

273 K

203 K

193 K

40. Particles that most effects material properties

Electrons

Protons

Neutrons

Valence electrons

41. The example of hexagonal system is

Graphite

Diamond

Sugar

Sulphur

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

Number of isotopes

Charge

Mass

Relative abundance

43. 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

44. 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 halved

Is changed by about 26%

Is unchanged

Change by 33%

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

MnO₂

NO₂

CrO₂

TiO₂

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

Graphite

Kcl

Sugar

Plastic

47. How many allotropic forms are present in carbon?

Four

Five

Three

Two

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

1.5057 x 10 ²⁴

3.0115 x 10 ²⁴

4.0956 x 10 ²⁴

2.0478 x 10 ²⁴

49. Amorphous substance posses

All of these

No definite geometry

No definite heat of fusion

No sharp melting points

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

Na(s) → N²⁺ (g) + 2e¯

Na(s) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + +¯

Page 3 of 6

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

3 moles

10 moles

3.5 moles

1.5 moles

52. 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

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

Gases do not have a definite shape and volume

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

Monoclimic

Mexagonal

Triclimic

Trigonal

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

700 mm of Hg

100 mm of Hg

790 mm of Hg

1489 mm of Hg

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

None of these

√P/d

P/d

P/√d

56. Which is distilled first?

Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

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

4 and 4

6 and 6

6 and 4

8 and 4

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

59. Mean distance between atoms in the range of

25 nm

2.5 nm

0.025 nm

0.25 nm

60. Half atmospheric pressure is

101.325 Pa

400 torr

8.5 Pounds

50 662 Pa

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

Ethanol

Water

Ether

Ammonia

62. The material possessing superconducting properties is

Yb Ba₂Cu₂O₈

Hg Be₂Ca₂Cu₂O₈

Y B₂Cu₃O₇

Y Ba₂Cu₃O₇

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

Dalton’s law

Charles’ law

Boyle’s law

Avogadro’s law

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

Condensation

Sublimation

Filtration

Vaporization

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

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

Twice that in 60 g carbon

558.5 x 6.022 x 10²³

Half that in 8 g of He

6.022 x 10²²

67. Which solids are called true solids?

Crystalline

Amorphous

Vitreous

Metallic

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

Low temperature

High ignition temperature

High concentration

High solubility

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

NH₃

CH₄

BH₃

H₂O

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

None

Crystal

Unit

Cleavage

71. 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

9.2 atm

9.74 atm

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

Allotropy

Polymorphism

Isomorphism

Anisotropy

73. Which of the following is a pseudo solid?

All these

Glass

NaCl

CaF₂

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

Allotropy

Isomorphism

Polymorphism

Anisotropy

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

Oxide of the gas is strongly acidic

The gas is chlorine

Colour of the gas is greenish yellow

A gas is liberated

Page 4 of 6

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

Crystallization

All

Chromatography

Solvent extraction

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

112 cm³

2.24 dm³

22.4 dm³

1.12 dm³

78. A solid may be made up of

A, B and C

Molecules

Ions

Atoms

79. The crystal structure having face centered cubic arrangement is

CuCl

CsCl

NaCl

BaCl₂

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

Decreased volume of the solution

Increased attraction between the molecules

Decreased covalent and hydrogen bond forces

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

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

0.64 g

0.16 g

0.32 g

0.96 g

82. 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

Increase two fold

Be a function of the molecular mass of substance

Remains unchanged

Decrease twice

83. 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:

Five

Four

Two

Three

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

Molecular solids

Covalent solids

Ionic solids

Pseudo solids

85. Repeatable entity of a crystal structure is known as

Lattice

Unit cell

Miller indices

Crystal

86. Isomorphic substances have

Different physical and chemical properties

Different physical and same chemical properties

Same physical and chemical properties

Same physical and different chemical properties

87. Bragg’s law is given by equation

nλ = 1/2d sin θ

nλ = 2 θ sin θ

nλ = 2 d sin θ

2nλ = d sin θ

88. Isomorphic substance have

Different physical and chemical properties

Different physical and same chemical properties

Same physical and difference chemical properties

Same physical and chemical properties

89. Which of the following is isotropic

Mercury

Graphite

Brass

Borax

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

546 °C

200 °C

546 K

0 K

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

CsCl type structure

AB₂ type ionic compound

NaCl type structure

ZnS type structure

92. Which is trigonal crystal?

CaSO₄.2H₂O

NaNO₃

MgSO₄

All

93. Which forms metallic crystals?

NH₄Cl

SO₂

NaCl

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

95. Van der Waal’s forces exist in

Polar compounds

Non-polar

All types of atoms and molecules

Covalent

96. A malleable solid is one which can be

All of these

Melted easily

Converted into wires

Converted into sheets

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

3200

4800

1524

4400

98. Fluted filter paper is used for

To avoid premature crystallization of the solute

Increasing the rate of filtration

To dissolve large amount of substance at its boiling point

Filtering the hot saturated solution

99. Potassium crystallizes with a

Triclinic

Orthogonal lattice

Ortho rhombic lattice

Cubic lattice

100. Ionic solids are characterized by

High vapour pressures

Low melting points

Solubility in polar solvents

Good conductivity in solid state

Page 5 of 6

101. Super conductors are derived from compounds of

Actinides

Transition elements

p-block elements

Lanthanides

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

3 liter atm

2 liter atm

1 liter atm

Zero

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

3.72 x 10¯²³ g

5.01 x 10¯²¹ g

1.3 x 10¯²⁰ g

1.4 x 10¯²¹ g

104. 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

Little bit less than the molar volumes of solids

Much larger than the molar volumes of liquids and solids

Little bit greater than the molar volumes of liquid

About the same as the molar volumes of liquids

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

Having wide spaces

Randomly moving

Causing pressure

Orderly arranged

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

Ione pair of electrons

Free valence electrons

Anions

Cations

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

One mole of NH₃ will produce ½ mole of N₂

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

One mole of NH₃ will produce 6 moles of N₂

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

108. 50dm³ of CO is burnt completely according to reaction 2CO + O₂ – 2CO₂ Choose the correct statement

Volume of CO₂ formed is 60 dm³

Volume of CO₂ formed is 25 dm³

Volume of O₂ required is 25 dm³

Volume of O₂ required is 50 dm³

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

Triangle

Octahedron

Tetrahedron

Cube

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

C₃H₁₀O₂

C₆H₁₀O₄

C₃H₅O₂

C₄H₁₀O₂

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

1 : 1

1 : 2

2 : 1

1 : 3

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

Liquid gas chromatography

Ascending paper chromatography

Liquid solid chromatography

Descending paper chromatography

113. 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

2.24 liters

11.2 liters

1 liter

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

Isotropical

Triclinic

Monoclinic

Rhombohedral

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

5.0 moles of SO₂

44.8 dm3 CO₂ at S.T.P

20 moles of S8

6 moles of S

116. 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

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

He will feel cool

He will feel warmth

His blood pressure will increase

117. 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

H₂

N₂

O₂

118. 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

119. Crystalline solids can be identified easily from their

Transition temperature

Definite geometry

Sharp melting point

Colour

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

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

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

None of these

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

121. Crystals can be classified into

14 crystal systems

7 crystal systems

3 crystal systems

4 crystal systems

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

Fast

None

Moderately

Slowly

123. In case of elements the polymorphism is called

Isomorphism

Allotropy

Crystalline forms

Isotopic form

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

They melt over a range of temperature

There are rigid and in-compressible

There is no orderly arrangement of particles

They are anisotropic

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

Molecules of all the gases have same size and same mass

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

Molecules are in chaotic motion

All molecular collisions are elastic

Page 6 of 6

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

HgS

Cul

Csl

Agl

127. The allotropic forms of an element are called

Allotropes

Isoelectronic

Unit Cell

Cleavage

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

129. Ice is ________ crystal

Covalent

Ionic

Metallic

Molecular

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

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

-10°C and 5.0 atm

131. Glass is a

Micro-crystalline solid

None of these

Super-cooled liquid

Gel

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

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

A high pressure, the volume of the gas becomes insignificant

At high pressure, the intermolecular attraction becomes significant

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

133. 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

3 atm

2 atm

1 atm

4 atm

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

AgBr

NH₄Br

CsBr

CuBr

135. 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

XT₃

X₃Y

XY₂

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

Monoclinic

Tetragonal

Rhombic

Trigonal

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

Non covalent bond force

Electrostatic force

Covalent bond

Electrical attraction

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

159 torr

159 g/m³

159 mm Hg.

159 g/Cm²

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

None of these

Polymorphism

Amorphism

Isomorphism

140. ‘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?

200

150

141. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

2.4 liter

2.24 liter

22.4 liter

44 liter

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

Increase of K.E of molecules

Increase in potential energy of molecules

Decrease of surface tension

Increase of intermolecular interactions

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

Normal filter paper

Both A & B

None

Fluted filter paper

144. Simple molecules or giant macromolecules are examples of

Diatic bond

Ionic compounds

Covalent bonds

Metallic bonds

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

2/π

π/2

2/√π

√π/2

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

This gives medium size crystals

This gives bigger size crystals

The filtrate is quick

Filtrate runs down without crystals

147. Amorphous substances possess

Sharp B.P.

No definite heat of fusion

Definite heat of fusion

Sharp melting points

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

7.0

3.0

8.0

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

0.05 M

0.2 M

0.25 M

0.1 M

150. The molar volume of CO₂ is maximum at

S.T.P (0°C and 1 atm)

0°C and 2 atm

273°C and 2 atm

127°C and 1 atm

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Maan AliLast Updated: April 19, 2025

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