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

None of these

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

NaCl type structure

CsCl type structure

ZnS type structure

AB₂ type ionic compound

3. Isomorphic substance have

Same physical and difference chemical properties

Different physical and same chemical properties

Same physical and chemical properties

Different physical and chemical properties

4. The crystal structure having face centered cubic arrangement is

CuCl

BaCl₂

CsCl

NaCl

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

Pressure of dust particles in air

Non-polar nature of gases

Elastic collisions of gas molecules

Different molar mass

6. 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

22.4 liters

11.2 liters

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

4.0956 x 10 ²⁴

2.0478 x 10 ²⁴

1.5057 x 10 ²⁴

3.0115 x 10 ²⁴

8. How many allotropic forms are present in carbon?

Five

Three

Two

Four

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

Na(s) → N²⁺ (g) + 2e¯

Na(g) → N²⁺ (g) + +¯

Na(s) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + e¯

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

Polymorphism

Amorphism

None of these

Isomorphism

11. Crystalline solids can be identified easily by their

Transition temperature

Definite geometry

All of these

Sharp m.P

12. The most efficient solvent extraction method is by using

Repeated extraction and large portion of solvent

Single extraction and large portion of solvent

Repeated extraction and small portion of solvent

Single extraction and small portion of solvent

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

Copper

Sodium

Magneisum

Zinc

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

CuBr

NH₄Br

CsBr

AgBr

15. 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

XT₃

X₃Y

16. Which solids are called true solids?

Vitreous

Metallic

Amorphous

Crystalline

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

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

The carbon atoms are arranged layers

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

22.4

2.24

2.016

20.16

19. Correct order of intermolecular forces

Gas < liquid < solid

Gas = liquid = solid

Liquid < gas < solid

20. Isotopes differ in

Arrangement of electrons in orbitals

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

Properties which depend upon mass

Chemical properties

21. 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

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

NH₃

CH₄

BH₃

H₂O

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

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

This gives medium size crystals

The filtrate is quick

This gives bigger size crystals

Filtrate runs down without crystals

25. Fluted filter paper is used for

Filtering the hot saturated solution

Increasing the rate of filtration

To avoid premature crystallization of the solute

To dissolve large amount of substance at its boiling point

Page 2 of 6

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

Both A & B

None

Fluted filter paper

Normal filter paper

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

Gets a single positive charge

Gets a double positive charge

Gets a double negative charge

Gets a single negative charge

28. Bragg’s law is given by equation

nλ = 2 d sin θ

2nλ = d sin θ

nλ = 2 θ sin θ

nλ = 1/2d sin θ

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

Tetrahedron

Octahedron

Triangle

Cube

30. The material possessing superconducting properties is

Hg Be₂Ca₂Cu₂O₈

Y Ba₂Cu₃O₇

Yb Ba₂Cu₂O₈

Y B₂Cu₃O₇

31. 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:

Two

Three

Four

Five

32. 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

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

None

Moderately

Fast

Slowly

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

7.0

8.0

3.0

35. Ionic solids are characterized by

Good conductivity in solid state

Solubility in polar solvents

Low melting points

High vapour pressures

36. 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

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

Low temperature

High solubility

High concentration

High ignition temperature

38. 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

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

Number of isotopes

Mass

Charge

Relative abundance

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

Decreased covalent and hydrogen bond forces

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

Decreased volume of the solution

Increased attraction between the molecules

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

There are rigid and in-compressible

There is no orderly arrangement of particles

They are anisotropic

They melt over a range of temperature

42. Which is trigonal crystal?

All

CaSO₄.2H₂O

NaNO₃

MgSO₄

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

Triclimic

Trigonal

Monoclimic

Mexagonal

44. Which of the following is isotropic

Borax

Brass

Graphite

Mercury

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

Csl

Agl

HgS

Cul

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

None

Unit

Crystal

Cleavage

47. 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.

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

None of these

48. The example of hexagonal system is

Sugar

Graphite

Sulphur

Diamond

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

TiO₂

CrO₂

NO₂

MnO₂

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

2/√π

2/π

π/2

√π/2

Page 3 of 6

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

Causing pressure

Having wide spaces

Orderly arranged

Randomly moving

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

N and F

O and F

C and F

Na and F

53. 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)

10.33 atm

9.2 atm

9.74 atm

9.333 atm

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

Tetrahedral manner

Square planner manner

Altahydral manner

Hexagonal manner

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

Both fcc and bcc

Bcc

Fcc

None of these

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

Non covalent bond force

Electrical attraction

Electrostatic force

Covalent bond

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

1 : 3

2 : 1

1 : 2

1 : 1

58. Potassium crystallizes with a

Ortho rhombic lattice

Orthogonal lattice

Cubic lattice

Triclinic

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

1.5 moles

3.5 moles

10 moles

3 moles

60. A malleable solid is one which can be

Melted easily

Converted into wires

All of these

Converted into sheets

61. 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 tm, and 500 K

15 atm, and 200 K

62. 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

63. Which of the following has least mass?

3 x 10²³ atoms of C

7.0 g of Ag.

2 gram atom of nitrogen

1 mole of S

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

Ether

Water

Ammonia

Ethanol

65. 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 L atm K¯¹ mol¯¹

8.31 x 10⁷ erg³ K¯¹ mol¯¹

8.31 JK¯¹ mol¯¹

66. 50dm³ of CO is burnt completely according to reaction 2CO + O₂ – 2CO₂ Choose the correct statement

Volume of CO₂ formed is 25 dm³

Volume of O₂ required is 50 dm³

Volume of O₂ required is 25 dm³

Volume of CO₂ formed is 60 dm³

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

68. Crystals can be classified into

4 crystal systems

7 crystal systems

14 crystal systems

3 crystal systems

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

Polymorphism

Isomorphism

Allotropy

Anisotropy

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

None of these

P/√d

√P/d

P/d

71. 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

Add water to the mixture and filter

Place the mixture in a separating funnel

Add dilute acid to the mixture and filter

72. 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 and B evaporates at the same rate

B evaporates less readily than C

B evaporates more readily than A

A evaporates more readily than C

73. In case of elements the polymorphism is called

Isomorphism

Allotropy

Isotopic form

Crystalline forms

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

159 g/m³

159 torr

159 g/Cm²

159 mm Hg.

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

1.3 x 10¯²⁰ g

3.72 x 10¯²³ g

5.01 x 10¯²¹ g

1.4 x 10¯²¹ g

Page 4 of 6

76. 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

Isomeric crystals

Isomorphous crystals

Liquid Crystals

77. Particles that most effects material properties

Electrons

Protons

Valence electrons

Neutrons

78. ‘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

79. Which is distilled first?

Liquid O₂

Liquid N₂

Liquid CO₂

Liquid H₂

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

The gas is chlorine

Oxide of the gas is strongly acidic

A gas is liberated

Colour of the gas is greenish yellow

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

Crystallization

Solvent extraction

All

Chromatography

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

6 moles of S

44.8 dm3 CO₂ at S.T.P

5.0 moles of SO₂

20 moles of S8

83. 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

Descending paper chromatography

Liquid solid chromatography

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

C₃H₁₀O₂

C₄H₁₀O₂

C₆H₁₀O₄

C₃H₅O₂

85. 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

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

Rhombohedral

Monoclinic

Isotropical

Triclinic

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

Sublimation

Filtration

Vaporization

Condensation

88. 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

3 atm

1 atm

2 atm

89. Van der Waal’s forces exist in

All types of atoms and molecules

Polar compounds

Covalent

Non-polar

90. Crystalline solids can be identified easily from their

Transition temperature

Colour

Sharp melting point

Definite geometry

91. Formation of a cation is?

Oxidation

None

Redox

Reduction

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

Charles’ law

Boyle’s law

Graham’s law

Dalton’s law

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

2 liter atm

Zero

3 liter atm

1 liter atm

94. Amorphous substance posses

No definite heat of fusion

No sharp melting points

No definite geometry

All of these

95. Which of the following are more temperature sensitive?

Liquid crystals

None of these

Ionic crystals

Solid crystals

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

Double

None

Half

Same

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

Gases do not have a definite shape and volume

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

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

98. 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

99. Glass is a

Micro-crystalline solid

Super-cooled liquid

None of these

Gel

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

Page 5 of 6

101. 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

About the same as the molar volumes of liquids

Little bit less than the molar volumes of solids

Little bit greater than the molar volumes of liquid

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

Charles’ law

Boyle’s law

Dalton’s law

Avogadro’s law

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

4 x 6.02 x 10²³

3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

104. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

22.4 liter

44 liter

2.24 liter

2.4 liter

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

22.4 dm³

2.24 dm³

112 cm³

1.12 dm³

106. Super conductors are derived from compounds of

Lanthanides

Transition elements

p-block elements

Actinides

107. Half atmospheric pressure is

8.5 Pounds

400 torr

50 662 Pa

101.325 Pa

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

Molecules are in chaotic motion

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

All molecular collisions are elastic

109. 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

His blood pressure will increase

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

110. A solid may be made up of

Ions

A, B and C

Molecules

Atoms

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

112. Which of the following substances is not amorphous?

Glass

Polymer

Ag NO₃

Rubber

113. 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

0.2 M

0.1 M

114. Which of the following is a pseudo solid?

Glass

CaF₂

NaCl

All these

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

Anions

Free valence electrons

Ione pair of electrons

Cations

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

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

One mole of NH₃ will produce 6 moles of N₂

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

Acetic acid

Sulphuric acid

Chloroform

Acetone

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

Increase of intermolecular interactions

Decrease of surface tension

Increase in potential energy of molecules

Increase of K.E of molecules

119. The mass of one mole of electron is

1.673 mg

0.104 mg

1.008 mg

0.55 mg

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

Trigonal

Tetragonal

Rhombic

Monoclinic

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

Kcl

Sugar

Plastic

Graphite

122. 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

Decrease twice

Remains unchanged

Be a function of the molecular mass of substance

123. Triple point of water is

193 K

203 K

373 K

273 K

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

6.022 x 10²²

Half that in 8 g of He

Twice that in 60 g carbon

558.5 x 6.022 x 10²³

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

0 K

200 °C

546 °C

546 K

Page 6 of 6

126. Mean distance between atoms in the range of

2.5 nm

0.25 nm

0.025 nm

25 nm

127. 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?

33 g

22 g

11 g

5.5 g

128. 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

At high pressure, the intermolecular attraction becomes significant

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

A high pressure, the volume of the gas becomes insignificant

129. The allotropic forms of an element are called

Cleavage

Isoelectronic

Allotropes

Unit Cell

130. Poor conductors of electricity is a characteristic of

Diatic bonds

Ionic compounds

Metallic compounds

Covalent compounds

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

0°C and 2.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

-10°C and 5.0 atm

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

18.75g

35.5g

71g

142g

133. Ice is ________ crystal

Metallic

Molecular

Ionic

Covalent

134. Under what conditions real gases deviate from ideal behavior

High pressure

Low temperature

Both b and c

High temperature

135. The molar volume of CO₂ is maximum at

273°C and 2 atm

0°C and 2 atm

S.T.P (0°C and 1 atm)

127°C and 1 atm

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

Covalent solids

Molecular solids

Pseudo solids

Ionic solids

137. Solvents of covalent compounds include all but

Water

Alcohol

Petrol

Tetra chloromethane

138. Repeatable entity of a crystal structure is known as

Crystal

Unit cell

Lattice

Miller indices

139. 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%

Change by 33%

Is unchanged

Is halved

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

Divalent impurity

Tetravalent

Pentavalent impurity

Trivalent impurity

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

Anisotropy

Isomorphism

Polymorphism

Allotropy

142. Solvent extraction is mostly applied to separate

Both A and B

Inorganic compounds

None of these

Organic compounds

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

4 and 4

6 and 6

6 and 4

8 and 4

144. Which forms metallic crystals?

NH₄Cl

SO₂

NaCl

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

0.96 g

0.32 g

0.16 g

0.64 g

146. 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 0.5 M

10 mL of 0.02 M

5 mL of 0.1 M

10 mL of 0.1 M

147. Simple molecules or giant macromolecules are examples of

Diatic bond

Covalent bonds

Ionic compounds

Metallic bonds

148. Amorphous substances possess

No definite heat of fusion

Sharp B.P.

Definite heat of fusion

Sharp melting points

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

CO₂ is 1.25 times faster than CO

CO is 1.25 times faster than CO₂

Both diffused at the same time

CO is 3.75 times faster than CO₂

150. 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

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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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