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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. Solvents of covalent compounds include all but

Alcohol

Petrol

Water

Tetra chloromethane

2. Which of the following is a pseudo solid?

CaF₂

NaCl

All these

Glass

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

Fast

Slowly

Moderately

None

4. 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

Zero

2 liter atm

1 liter atm

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

CH₄ and AlCl₃

NH₃ and H⁺

H₂O and H⁺

NH₃ and BF₃

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

2.016

22.4

20.16

2.24

7. A malleable solid is one which can be

All of these

Melted easily

Converted into wires

Converted into sheets

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

8.0

3.0

7.0

9. 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 cool

He will feel warmth

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

His blood pressure will increase

10. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

2.4 liter

22.4 liter

44 liter

2.24 liter

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

Anisotropy

Polymorphism

Isomorphism

Allotropy

12. Which of the following is isotropic

Graphite

Borax

Mercury

Brass

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

Relative abundance

Number of isotopes

Charge

Mass

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

π/2

2/√π

√π/2

2/π

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

Pressure of dust particles in air

Elastic collisions of gas molecules

Non-polar nature of gases

Different molar mass

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

Polymorphism

Allotropy

Anisotropy

Isomorphism

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

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

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

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

Gases do not have a definite shape and volume

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

22.4 dm³

1.12 dm³

2.24 dm³

112 cm³

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

Trivalent impurity

Divalent impurity

Tetravalent

Pentavalent impurity

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

159 mm Hg.

159 g/m³

159 g/Cm²

159 torr

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

Altahydral manner

Hexagonal manner

Tetrahedral manner

Square planner manner

22. Simple molecules or giant macromolecules are examples of

Ionic compounds

Metallic bonds

Diatic bond

Covalent bonds

23. 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

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

H₂O

CH₄

NH₃

BH₃

25. Which is distilled first?

Liquid H₂

Liquid O₂

Liquid N₂

Liquid CO₂

Page 2 of 6

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

Filtrate runs down without crystals

The filtrate is quick

This gives medium size crystals

This gives bigger size crystals

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

3.72 x 10¯²³ g

1.4 x 10¯²¹ g

5.01 x 10¯²¹ g

1.3 x 10¯²⁰ g

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

-10°C and 5.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

100°C and 2.0 atm

29. Formation of a cation is?

Reduction

None

Oxidation

Redox

30. Super conductors are derived from compounds of

Actinides

p-block elements

Transition elements

Lanthanides

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

There is no orderly arrangement of particles

They melt over a range of temperature

There are rigid and in-compressible

They are anisotropic

32. Amorphous substance posses

All of these

No definite heat of fusion

No sharp melting points

No definite geometry

33. Which of the following are more temperature sensitive?

Liquid crystals

None of these

Ionic crystals

Solid crystals

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

35. Crystalline solids can be identified easily from their

Transition temperature

Definite geometry

Sharp melting point

Colour

36. The mass of one mole of electron is

1.008 mg

0.104 mg

1.673 mg

0.55 mg

37. The example of hexagonal system is

Sulphur

Graphite

Sugar

Diamond

38. 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

B evaporates less readily than C

A evaporates more readily than C

A and B evaporates at the same rate

39. 50dm³ of CO is burnt completely according to reaction 2CO + O₂ – 2CO₂ Choose the correct statement

Volume of O₂ required is 25 dm³

Volume of CO₂ formed is 60 dm³

Volume of O₂ required is 50 dm³

Volume of CO₂ formed is 25 dm³

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

None of these

Bcc

Fcc

Both fcc and bcc

41. The material possessing superconducting properties is

Hg Be₂Ca₂Cu₂O₈

Y B₂Cu₃O₇

Yb Ba₂Cu₂O₈

Y Ba₂Cu₃O₇

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

Plastic

Kcl

Sugar

Graphite

43. 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

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

Decreased volume of the solution

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

790 mm of Hg

100 mm of Hg

700 mm of Hg

1489 mm of Hg

45. 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?

11 g

5.5 g

33 g

22 g

46. Amorphous substances possess

Definite heat of fusion

No definite heat of fusion

Sharp B.P.

Sharp melting points

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

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

2.24 liters

1 liter

11.2 liters

22.4 liters

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

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

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

None of these

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

50. Mean distance between atoms in the range of

25 nm

0.025 nm

2.5 nm

0.25 nm

Page 3 of 6

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

None of these

52. 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

2 atm

4 atm

3 atm

1 atm

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

None

Fluted filter paper

Normal filter paper

Both A & B

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

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

Low temperature

High ignition temperature

High solubility

High concentration

56. 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

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

Monoclinic

Trigonal

Tetragonal

Rhombic

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

CO is 3.75 times faster than CO₂

Both diffused at the same time

CO is 1.25 times faster than CO₂

CO₂ is 1.25 times faster than CO

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

NO₂

TiO₂

CrO₂

MnO₂

60. Amorphous solids

Have sharp melting point

Have perfect arrangement of atoms

Can possess small regions of orderly arrangement of atoms

Undergo clean cleave when cut with knife

61. Isomorphic substance have

Same physical and chemical properties

Same physical and difference chemical properties

Different physical and same chemical properties

Different physical and chemical properties

62. In case of elements the polymorphism is called

Isomorphism

Allotropy

Crystalline forms

Isotopic form

63. Which forms metallic crystals?

SO₂

NH₄Cl

NaCl

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

Half

Double

Same

None

65. Half atmospheric pressure is

50 662 Pa

101.325 Pa

400 torr

8.5 Pounds

66. 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

At high pressure, the intermolecular attraction becomes significant

A high pressure, the volume of the gas becomes insignificant

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

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

546 K

546 °C

200 °C

0 K

68. 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 solid chromatography

Ascending paper chromatography

Liquid gas chromatography

69. A solid may be made up of

Molecules

A, B and C

Atoms

Ions

70. Solvent extraction is mostly applied to separate

Inorganic compounds

Both A and B

Organic compounds

None of these

71. 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

Little bit greater than the molar volumes of liquid

Much larger than the molar volumes of liquids and solids

About the same as the molar volumes of liquids

72. Ionic solids are characterized by

High vapour pressures

Solubility in polar solvents

Good conductivity in solid state

Low melting points

73. Which of the following substances is not amorphous?

Glass

Ag NO₃

Polymer

Rubber

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

Charles’ law

Dalton’s law

Avogadro’s law

Boyle’s law

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

Colour of the gas is greenish yellow

Oxide of the gas is strongly acidic

The gas is chlorine

A gas is liberated

Page 4 of 6

76. Which of the following has least mass?

7.0 g of Ag.

3 x 10²³ atoms of C

2 gram atom of nitrogen

1 mole of S

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

Ether

Ammonia

Ethanol

Water

78. Isotopes differ in

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

Arrangement of electrons in orbitals

Properties which depend upon mass

Chemical properties

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

10 moles

3.5 moles

1.5 moles

3 moles

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

Orderly arranged

Causing pressure

Randomly moving

Having wide spaces

81. How many allotropic forms are present in carbon?

Five

Three

Two

Four

82. Ice is ________ crystal

Ionic

Molecular

Covalent

Metallic

83. Which is trigonal crystal?

NaNO₃

All

CaSO₄.2H₂O

MgSO₄

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

Trigonal

Mexagonal

Monoclimic

Triclimic

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

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

Molecules of all the gases have same size and same mass

Molecules are in chaotic motion

All molecular collisions are elastic

86. 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)

9.74 atm

9.333 atm

10.33 atm

9.2 atm

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

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

Gets a single negative charge

Gets a double negative charge

Gets a single positive charge

Gets a double positive charge

89. 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

2.0478 x 10 ²⁴

4.0956 x 10 ²⁴

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

P/√d

None of these

P/d

√P/d

91. Which solids are called true solids?

Vitreous

Crystalline

Amorphous

Metallic

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

4 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

3/2 x 6.02 x 10²³

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

Na and F

N and F

O and F

C and F

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

Increase of intermolecular interactions

Increase in potential energy of molecules

Decrease of surface tension

Increase of K.E of molecules

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

Anions

Ione pair of electrons

Free valence electrons

Cations

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

15 atm, and 200 K

1 atm, and 273 K

15 tm, and 500 K

0.5 atm, and 500 K

97. The crystal structure having face centered cubic arrangement is

NaCl

CuCl

BaCl₂

CsCl

98. Bragg’s law is given by equation

nλ = 1/2d sin θ

2nλ = d sin θ

nλ = 2 θ sin θ

nλ = 2 d sin θ

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

1 : 3

1 : 2

1 : 1

2 : 1

100. Particles that most effects material properties

Neutrons

Valence electrons

Electrons

Protons

Page 5 of 6

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

Graham’s law

Boyle’s law

Dalton’s law

Charles’ law

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

Copper

Magneisum

Sodium

Zinc

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

35.5g

71g

142g

18.75g

104. Van der Waal’s forces exist in

All types of atoms and molecules

Polar compounds

Covalent

Non-polar

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

C₆H₁₀O₄

C₃H₅O₂

C₃H₁₀O₂

C₄H₁₀O₂

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

Na(g) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + +¯

Na(s) → N²⁺ (g) + 2e¯

Na(s) → N²⁺ (g) + e¯

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

ZnS type structure

CsCl type structure

NaCl type structure

AB₂ type ionic compound

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

4 and 4

8 and 4

6 and 6

6 and 4

109. 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

110. 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 x 10⁷ erg³ K¯¹ mol¯¹

8.31 L atm K¯¹ mol¯¹

111. The molar volume of CO₂ is maximum at

127°C and 1 atm

S.T.P (0°C and 1 atm)

273°C and 2 atm

0°C and 2 atm

112. Correct order of intermolecular forces

Gas < liquid < solid

Liquid < gas < solid

Gas = liquid = solid

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

Acetic acid

Chloroform

Sulphuric acid

Acetone

114. 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

115. Isomorphic substances have

Same physical and chemical properties

Different physical and chemical properties

Same physical and different chemical properties

Different physical and same chemical properties

116. 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

N₂

H₂

117. Under what conditions real gases deviate from ideal behavior

Low temperature

High temperature

Both b and c

High pressure

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

Crystallization

Chromatography

All

Solvent extraction

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

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

The coordination number of carbon atoms is 4

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

The carbon atoms are arranged layers

120. 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

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

None of these

Polymorphism

Amorphism

Isomorphism

122. Triple point of water is

193 K

203 K

273 K

373 K

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

1524

3200

4800

4400

124. ‘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

125. 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 6 of 6

126. Crystals can be classified into

3 crystal systems

7 crystal systems

14 crystal systems

4 crystal systems

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

Cube

Triangle

Tetrahedron

Octahedron

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

Cleavage

Unit

Crystal

None

129. Crystalline solids can be identified easily by their

All of these

Sharp m.P

Definite geometry

Transition temperature

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

One mole of NH₃ will produce 6 moles of N₂

One mole of NH₃ will produce ½ mole of N₂

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

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

131. 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 0.02 M

10 mL of 0.5 M

5 mL of 0.1 M

10 mL of 0.1 M

132. The allotropic forms of an element are called

Allotropes

Isoelectronic

Cleavage

Unit Cell

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

Filtration

Vaporization

Condensation

Sublimation

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

Triclinic

Monoclinic

Isotropical

Rhombohedral

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

Covalent bond

Electrical attraction

Non covalent bond force

Electrostatic force

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

Cul

Csl

HgS

Agl

137. Glass is a

None of these

Super-cooled liquid

Micro-crystalline solid

Gel

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

Molecular solids

Pseudo solids

Ionic solids

Covalent solids

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

Add water to the mixture and filter

Place the mixture in a separating funnel

Add dilute acid to the mixture and filter

Heat the mixture and allow it to cool

140. 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

0.1 M

0.25 M

0.2 M

141. Poor conductors of electricity is a characteristic of

Covalent compounds

Metallic compounds

Ionic compounds

Diatic bonds

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

0.64 g

0.16 g

0.96 g

0.32 g

143. Potassium crystallizes with a

Orthogonal lattice

Triclinic

Ortho rhombic lattice

Cubic lattice

144. The most efficient solvent extraction method is by using

Single extraction and large portion of solvent

Single extraction and small portion of solvent

Repeated extraction and small portion of solvent

Repeated extraction and large portion of solvent

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

20 moles of S8

44.8 dm3 CO₂ at S.T.P

5.0 moles of SO₂

6 moles of S

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

CsBr

NH₄Br

AgBr

CuBr

147. 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

Remains unchanged

Decrease twice

Be a function of the molecular mass of substance

Increase two fold

148. Fluted filter paper is used for

To avoid premature crystallization of the solute

Filtering the hot saturated solution

To dissolve large amount of substance at its boiling point

Increasing the rate of filtration

149. Repeatable entity of a crystal structure is known as

Lattice

Miller indices

Crystal

Unit cell

150. 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

Liquid Crystals

Isomorphous crystals

Isomeric crystals

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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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