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

Octahedron

Triangle

Cube

Tetrahedron

2. Poor conductors of electricity is a characteristic of

Ionic compounds

Metallic compounds

Covalent compounds

Diatic bonds

3. 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

0.2 M

0.05 M

0.1 M

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

√P/d

None of these

P/√d

P/d

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

C₄H₁₀O₂

C₃H₁₀O₂

C₆H₁₀O₄

C₃H₅O₂

6. Isotopes differ in

Properties which depend upon mass

Chemical properties

Arrangement of electrons in orbitals

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

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

159 g/Cm²

159 mm Hg.

159 g/m³

159 torr

8. A solid may be made up of

Atoms

Molecules

A, B and C

Ions

9. Which is trigonal crystal?

NaNO₃

CaSO₄.2H₂O

All

MgSO₄

10. The material possessing superconducting properties is

Y B₂Cu₃O₇

Yb Ba₂Cu₂O₈

Y Ba₂Cu₃O₇

Hg Be₂Ca₂Cu₂O₈

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

Covalent bond

Electrical attraction

Non covalent bond force

Electrostatic force

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

NO₂

TiO₂

MnO₂

CrO₂

13. 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

14. Under what conditions real gases deviate from ideal behavior

High temperature

Low temperature

Both b and c

High pressure

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

Decrease of surface tension

Increase of intermolecular interactions

Increase in potential energy of molecules

Increase of K.E of molecules

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

0.16 g

0.32 g

0.96 g

0.64 g

17. 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

Add water to the mixture and filter

Heat the mixture and allow it to cool

Place the mixture in a separating funnel

18. 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

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

Liquid solid chromatography

Ascending paper chromatography

Liquid gas chromatography

Descending paper chromatography

20. The crystal structure having face centered cubic arrangement is

CsCl

NaCl

CuCl

BaCl₂

21. Amorphous substances possess

Sharp melting points

Definite heat of fusion

No definite heat of fusion

Sharp B.P.

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

Increased attraction between the molecules

Decreased covalent and hydrogen bond forces

Decreased volume of the solution

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

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

Csl

Agl

HgS

Cul

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

Rhombohedral

Isotropical

Monoclinic

Triclinic

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

0°C and 2.0 atm

-10°C and 2.0 atm

-10°C and 5.0 atm

100°C and 2.0 atm

Page 2 of 6

26. Crystals can be classified into

7 crystal systems

14 crystal systems

3 crystal systems

4 crystal systems

27. Ionic solids are characterized by

Solubility in polar solvents

High vapour pressures

Low melting points

Good conductivity in solid state

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

1 : 2

1 : 1

2 : 1

1 : 3

29. The example of hexagonal system is

Sulphur

Diamond

Graphite

Sugar

30. Potassium crystallizes with a

Ortho rhombic lattice

Cubic lattice

Triclinic

Orthogonal lattice

31. 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

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

Magneisum

Copper

Sodium

Zinc

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

CH₄ and AlCl₃

H₂O and H⁺

NH₃ and H⁺

NH₃ and BF₃

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

H₂O

CH₄

NH₃

BH₃

35. Super conductors are derived from compounds of

p-block elements

Transition elements

Actinides

Lanthanides

36. 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

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

Plastic

Kcl

Graphite

Sugar

38. 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

2 atm

1 atm

3 atm

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

All molecular collisions are elastic

Molecules are in chaotic motion

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

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

546 °C

0 K

546 K

200 °C

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

Chloroform

Acetone

Acetic acid

Sulphuric acid

42. Solvents of covalent compounds include all but

Petrol

Water

Tetra chloromethane

Alcohol

43. Half atmospheric pressure is

50 662 Pa

400 torr

101.325 Pa

8.5 Pounds

44. Which of the following is isotropic

Graphite

Borax

Mercury

Brass

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

Anisotropy

Allotropy

Isomorphism

Polymorphism

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

3.5 moles

10 moles

3 moles

1.5 moles

47. Van der Waal’s forces exist in

All types of atoms and molecules

Covalent

Polar compounds

Non-polar

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

Square planner manner

Tetrahedral manner

Hexagonal manner

Altahydral manner

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

None

Fast

Moderately

Slowly

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

None of these

Page 3 of 6

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

1.12 dm³

2.24 dm³

112 cm³

22.4 dm³

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

The coordination number of carbon atoms is 4

The carbon atoms are arranged layers

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

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

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

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

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

54. Isomorphic substance have

Different physical and chemical properties

Same physical and difference chemical properties

Different physical and same chemical properties

Same physical and chemical properties

55. The allotropic forms of an element are called

Cleavage

Isoelectronic

Unit Cell

Allotropes

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

3.0

8.0

7.0

57. Simple molecules or giant macromolecules are examples of

Diatic bond

Covalent bonds

Metallic bonds

Ionic compounds

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

100 mm of Hg

700 mm of Hg

790 mm of Hg

1489 mm of Hg

59. 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

11 g

22 g

5.5 g

60. 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 mole of NH₃ 20g of O₂ are required

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

61. 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

3 liter atm

Zero

2 liter atm

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

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

5.0 moles of SO₂

6 moles of S

20 moles of S8

44.8 dm3 CO₂ at S.T.P

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

Same

Half

None

Double

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

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

142g

18.75g

35.5g

71g

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

3.72 x 10¯²³ g

5.01 x 10¯²¹ g

1.4 x 10¯²¹ g

1.3 x 10¯²⁰ g

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

Charge

Mass

Relative abundance

Number of isotopes

69. 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

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

0.5 atm, and 500 K

15 atm, and 200 K

1 atm, and 273 K

15 tm, and 500 K

71. 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

72. Crystalline solids can be identified easily from their

Sharp melting point

Colour

Definite geometry

Transition temperature

73. How many allotropic forms are present in carbon?

Two

Five

Four

Three

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

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

Gases do not have a definite shape and volume

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

75. Triple point of water is

193 K

373 K

203 K

273 K

Page 4 of 6

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

Charles’ law

Dalton’s law

Graham’s law

Boyle’s law

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

Polymorphism

Isomorphism

None of these

Amorphism

78. 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

Liquid Crystals

Isomorphous crystals

79. 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

80. Which of the following are more temperature sensitive?

Liquid crystals

None of these

Solid crystals

Ionic crystals

81. Particles that most effects material properties

Protons

Valence electrons

Electrons

Neutrons

82. In case of elements the polymorphism is called

Isotopic form

Isomorphism

Allotropy

Crystalline forms

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

Isomorphism

Anisotropy

Allotropy

Polymorphism

84. 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

Three

Four

Two

85. 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

6.022 x 10²²

558.5 x 6.022 x 10²³

Twice that in 60 g carbon

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

Tetravalent

Trivalent impurity

Divalent impurity

Pentavalent impurity

87. Ice is ________ crystal

Molecular

Ionic

Metallic

Covalent

88. Bragg’s law is given by equation

nλ = 1/2d sin θ

nλ = 2 d sin θ

nλ = 2 θ sin θ

2nλ = d sin θ

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

2/√π

2/π

π/2

√π/2

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

Na(s) → N²⁺ (g) + e¯

Na(g) → N²⁺ (g) + +¯

Na(g) → N²⁺ (g) + e¯

Na(s) → N²⁺ (g) + 2e¯

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

Gets a double negative charge

Gets a single negative charge

Gets a single positive charge

Gets a double positive charge

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

Normal filter paper

Fluted filter paper

None

Both A & B

93. Amorphous substance posses

All of these

No definite geometry

No definite heat of fusion

No sharp melting points

94. 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

95. 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

96. Crystalline solids can be identified easily by their

Transition temperature

Sharp m.P

All of these

Definite geometry

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

4 and 4

8 and 4

6 and 4

6 and 6

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

11.2 liters

22.4 liters

2.24 liters

1 liter

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

Causing pressure

Orderly arranged

Randomly moving

Having wide spaces

100. Mean distance between atoms in the range of

2.5 nm

0.025 nm

0.25 nm

25 nm

Page 5 of 6

101. 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 halved

Is unchanged

102. Which of the following substances is not amorphous?

Glass

Polymer

Ag NO₃

Rubber

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

There is no orderly arrangement of particles

They are anisotropic

There are rigid and in-compressible

They melt over a range of temperature

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

Water

Ammonia

Ether

Ethanol

105. A malleable solid is one which can be

Converted into sheets

All of these

Melted easily

Converted into wires

106. 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

107. 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

108. The most efficient solvent extraction method is by using

Repeated extraction and large portion of solvent

Repeated extraction and small portion of solvent

Single extraction and large portion of solvent

Single extraction and small portion of solvent

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

CuBr

AgBr

NH₄Br

CsBr

110. Formation of a cation is?

Oxidation

Reduction

None

Redox

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

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

CO is 1.25 times faster than CO₂

CO is 3.75 times faster than CO₂

Both diffused at the same time

CO₂ is 1.25 times faster than CO

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

114. 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

9.74 atm

9.2 atm

9.333 atm

115. Amorphous solids

Have perfect arrangement of atoms

Have sharp melting point

Can possess small regions of orderly arrangement of atoms

Undergo clean cleave when cut with knife

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

Monoclimic

Trigonal

Triclimic

Mexagonal

117. Correct order of intermolecular forces

Liquid < gas < solid

Gas < liquid < solid

Gas = liquid = solid

Gas < liquid < solid

118. 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

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

He will feel cool

His blood pressure will increase

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

ZnS type structure

AB₂ type ionic compound

NaCl type structure

CsCl type structure

120. 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

121. Solvent extraction is mostly applied to separate

Organic compounds

Both A and B

None of these

Inorganic compounds

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

Vaporization

Condensation

Filtration

Sublimation

123. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

2.24 liter

22.4 liter

2.4 liter

44 liter

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

Unit

Crystal

None

Cleavage

125. Which forms metallic crystals?

NaCl

NH₄Cl

SO₂

Page 6 of 6

126. Fluted filter paper is used for

To dissolve large amount of substance at its boiling point

Increasing the rate of filtration

To avoid premature crystallization of the solute

Filtering the hot saturated solution

127. The mass of one mole of electron is

0.104 mg

1.008 mg

0.55 mg

1.673 mg

128. Which of the following has least mass?

3 x 10²³ atoms of C

2 gram atom of nitrogen

1 mole of S

7.0 g of Ag.

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

8.31 JK¯¹ mol¯¹

8.31 x 10⁷ erg³ K¯¹ mol¯¹

8.31 x 10⁷ dynes Cm K¯¹ mol¯¹

8.31 L atm K¯¹ mol¯¹

130. 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

5 mL of 0.1 M

10 mL of 0.1 M

10 mL of 0.02 M

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

1524

4800

3200

4400

132. The molar volume of CO₂ is maximum at

0°C and 2 atm

127°C and 1 atm

S.T.P (0°C and 1 atm)

273°C and 2 atm

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

Free valence electrons

Ione pair of electrons

Cations

Anions

134. 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

2.0478 x 10 ²⁴

4.0956 x 10 ²⁴

135. ‘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

136. Which of the following is a pseudo solid?

CaF₂

All these

NaCl

Glass

137. Glass is a

Super-cooled liquid

Gel

Micro-crystalline solid

None of these

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

Ionic solids

Molecular solids

Pseudo solids

Covalent solids

139. 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

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

1/25

1/5

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

The gas is chlorine

Colour of the gas is greenish yellow

A gas is liberated

Oxide of the gas is strongly acidic

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

All

Solvent extraction

Chromatography

Crystallization

143. Repeatable entity of a crystal structure is known as

Lattice

Miller indices

Crystal

Unit cell

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

Bcc

None of these

Both fcc and bcc

Fcc

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

Charles’ law

Avogadro’s law

Dalton’s law

Boyle’s law

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

Low temperature

High concentration

High solubility

High ignition temperature

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

Trigonal

Monoclinic

Rhombic

Tetragonal

148. Which solids are called true solids?

Crystalline

Vitreous

Metallic

Amorphous

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

None of these

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

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

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

150. Which is distilled first?

Liquid CO₂

Liquid O₂

Liquid N₂

Liquid H₂

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Maan AliLast Updated: April 19, 2025

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Chemistry Solids MCQS Online Test

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