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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. Fluted filter paper is used for

To dissolve large amount of substance at its boiling point

Filtering the hot saturated solution

Increasing the rate of filtration

To avoid premature crystallization of the solute

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

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

One mole of NH₃ will produce ½ mole of N₂

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

One mole of NH₃ will produce 6 moles of N₂

3. 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)

9.2 atm

9.74 atm

9.333 atm

10.33 atm

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

-10°C and 2.0 atm

0°C and 2.0 atm

-10°C and 5.0 atm

100°C and 2.0 atm

5. Which is trigonal crystal?

MgSO₄

All

NaNO₃

CaSO₄.2H₂O

6. Under what conditions real gases deviate from ideal behavior

Low temperature

High temperature

High pressure

Both b and c

7. 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

0.1 M

0.2 M

0.05 M

8. 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

9. 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

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

Dalton’s law

Boyle’s law

Graham’s law

Charles’ law

11. Which is distilled first?

Liquid O₂

Liquid CO₂

Liquid N₂

Liquid H₂

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

Sulphuric acid

Acetic acid

Acetone

Chloroform

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

Kcl

Sugar

Graphite

Plastic

14. Solvents of covalent compounds include all but

Water

Petrol

Alcohol

Tetra chloromethane

15. Potassium crystallizes with a

Triclinic

Orthogonal lattice

Ortho rhombic lattice

Cubic lattice

16. A solid may be made up of

Ions

A, B and C

Atoms

Molecules

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

Bcc

Fcc

None of these

Both fcc and bcc

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

Filtration

Sublimation

Condensation

Vaporization

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

Divalent impurity

Trivalent impurity

Pentavalent impurity

Tetravalent

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

None of these

21. Which solids are called true solids?

Vitreous

Metallic

Crystalline

Amorphous

22. Which of the following is a pseudo solid?

Glass

All these

CaF₂

NaCl

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

6 and 6

6 and 4

4 and 4

8 and 4

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

CsCl type structure

AB₂ type ionic compound

ZnS type structure

NaCl type structure

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

200 °C

546 °C

546 K

0 K

Page 2 of 6

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

Half

None

Same

Double

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

Elastic collisions of gas molecules

Non-polar nature of gases

Different molar mass

Pressure of dust particles in air

28. 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

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

None

Slowly

Fast

Moderately

30. A malleable solid is one which can be

Converted into wires

Melted easily

Converted into sheets

All of these

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

Both diffused at the same time

CO is 1.25 times faster than CO₂

CO is 3.75 times faster than CO₂

CO₂ is 1.25 times faster than CO

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

35.5g

142g

18.75g

71g

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

Csl

HgS

Agl

Cul

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

Free valence electrons

Anions

Ione pair of electrons

Cations

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

2/π

2/√π

π/2

√π/2

36. Amorphous substances possess

Sharp melting points

Sharp B.P.

No definite heat of fusion

Definite heat of fusion

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

Gets a double positive charge

Gets a single negative charge

Gets a double negative charge

Gets a single positive charge

38. In case of elements the polymorphism is called

Crystalline forms

Isotopic form

Isomorphism

Allotropy

39. 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 0.1 M

5 mL of 0.1 M

10 mL of 0.02 M

40. Crystalline solids can be identified easily by their

All of these

Sharp m.P

Definite geometry

Transition temperature

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

Electrical attraction

Non covalent bond force

Covalent bond

Electrostatic force

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

Chromatography

Solvent extraction

Crystallization

All

43. Which forms metallic crystals?

SO₂

NH₄Cl

NaCl

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

100 mm of Hg

790 mm of Hg

1489 mm of Hg

700 mm of Hg

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

Amorphism

None of these

Isomorphism

Polymorphism

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

0.16 g

0.32 g

0.96 g

0.64 g

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

Charles’ law

Avogadro’s law

Dalton’s law

Boyle’s law

48. 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

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

Rhombic

Monoclinic

Tetragonal

Trigonal

50. 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 O₂ required is 50 dm³

Volume of CO₂ formed is 25 dm³

Volume of O₂ required is 25 dm³

Page 3 of 6

51. Simple molecules or giant macromolecules are examples of

Diatic bond

Metallic bonds

Ionic compounds

Covalent bonds

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

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

None of these

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

NH₃

H₂O

CH₄

BH₃

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

The coordination number of carbon atoms is 4

55. 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

56. How many allotropic forms are present in carbon?

Four

Five

Two

Three

57. ‘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

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

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

Isomorphism

Anisotropy

Polymorphism

Allotropy

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

Pseudo solids

Ionic solids

Covalent solids

Molecular solids

61. Poor conductors of electricity is a characteristic of

Metallic compounds

Diatic bonds

Ionic compounds

Covalent compounds

62. Half atmospheric pressure is

50 662 Pa

101.325 Pa

400 torr

8.5 Pounds

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

Low temperature

High concentration

High solubility

High ignition temperature

64. 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

65. 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

Liquid Crystals

Allotropic crystal

Isomeric crystals

66. 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

67. Isomorphic substances have

Same physical and different chemical properties

Different physical and chemical properties

Different physical and same chemical properties

Same physical and chemical properties

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

Octahedron

Triangle

Cube

Tetrahedron

69. Super conductors are derived from compounds of

Transition elements

p-block elements

Actinides

Lanthanides

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

7.0

8.0

3.0

71. 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

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

Triclinic

Rhombohedral

Monoclinic

Isotropical

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

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

112 cm³

1.12 dm³

2.24 dm³

22.4 dm³

75. Mean distance between atoms in the range of

0.25 nm

25 nm

0.025 nm

2.5 nm

Page 4 of 6

76. Which of the following are more temperature sensitive?

Ionic crystals

None of these

Solid crystals

Liquid crystals

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

Ammonia

Water

Ethanol

Ether

78. Isotopes differ in

Chemical properties

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

Properties which depend upon mass

Arrangement of electrons in orbitals

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

This gives bigger size crystals

Filtrate runs down without crystals

This gives medium size crystals

The filtrate is quick

80. Ice is ________ crystal

Covalent

Ionic

Metallic

Molecular

81. 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

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

Remains unchanged

Decrease twice

Be a function of the molecular mass of substance

83. 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

X₃Y

XT₃

XY₂

84. Bragg’s law is given by equation

2nλ = d sin θ

nλ = 2 θ sin θ

nλ = 1/2d sin θ

nλ = 2 d sin θ

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

1 : 3

1 : 1

1 : 2

2 : 1

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

Both A & B

Fluted filter paper

None

Normal filter paper

87. Glass is a

None of these

Micro-crystalline solid

Gel

Super-cooled liquid

88. Isomorphic substance have

Different physical and same chemical properties

Same physical and chemical properties

Same physical and difference chemical properties

Different physical and chemical properties

89. 4.4 g of CO₂ contains how many liters of CO₂ at STP?

2.24 liter

22.4 liter

2.4 liter

44 liter

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

H₂O and H⁺

CH₄ and AlCl₃

NH₃ and H⁺

NH₃ and BF₃

91. Formation of a cation is?

Reduction

Redox

Oxidation

None

92. Crystalline solids can be identified easily from their

Transition temperature

Colour

Definite geometry

Sharp melting point

93. 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

94. 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

Three

Two

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

20 moles of S8

6 moles of S

5.0 moles of SO₂

44.8 dm3 CO₂ at S.T.P

96. 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

3 atm

4 atm

1 atm

97. 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

O₂

N₂

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

TiO₂

NO₂

MnO₂

CrO₂

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

CsBr

NH₄Br

CuBr

AgBr

100. The material possessing superconducting properties is

Hg Be₂Ca₂Cu₂O₈

Y B₂Cu₃O₇

Yb Ba₂Cu₂O₈

Y Ba₂Cu₃O₇

Page 5 of 6

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

3.0115 x 10 ²⁴

4.0956 x 10 ²⁴

1.5057 x 10 ²⁴

2.0478 x 10 ²⁴

102. 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 greater than the molar volumes of liquid

Little bit less than the molar volumes of solids

About the same as the molar volumes of liquids

Much larger than the molar volumes of liquids and solids

103. Crystals can be classified into

14 crystal systems

3 crystal systems

4 crystal systems

7 crystal systems

104. The crystal structure having face centered cubic arrangement is

NaCl

CuCl

BaCl₂

CsCl

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

106. The mass of one mole of electron is

1.008 mg

1.673 mg

0.104 mg

0.55 mg

107. The example of hexagonal system is

Sulphur

Graphite

Diamond

Sugar

108. Solvent extraction is mostly applied to separate

Inorganic compounds

Organic compounds

Both A and B

None of these

109. 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

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

111. Ionic solids are characterized by

Low melting points

High vapour pressures

Solubility in polar solvents

Good conductivity in solid state

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

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

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

113. 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

Half that in 8 g of He

558.5 x 6.022 x 10²³

6.022 x 10²²

114. 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

Change by 33%

Is halved

Is changed by about 26%

Is unchanged

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

Allotropy

Anisotropy

Isomorphism

Polymorphism

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

Place the mixture in a separating funnel

Heat the mixture and allow it to cool

Add water to the mixture and filter

Add dilute acid to the mixture and filter

117. Amorphous solids

Can possess small regions of orderly arrangement of atoms

Undergo clean cleave when cut with knife

Have sharp melting point

Have perfect arrangement of atoms

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

Sodium

Copper

Zinc

Magneisum

119. The allotropic forms of an element are called

Unit Cell

Cleavage

Allotropes

Isoelectronic

120. 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

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

Cleavage

None

Unit

Crystal

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

8.31 x 10⁷ erg³ K¯¹ mol¯¹

8.31 JK¯¹ mol¯¹

8.31 L atm K¯¹ mol¯¹

8.31 x 10⁷ dynes Cm K¯¹ mol¯¹

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

Randomly moving

Causing pressure

Orderly arranged

Having wide spaces

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

Zero

3 liter atm

2 liter atm

1 liter atm

125. Amorphous substance posses

No definite heat of fusion

All of these

No definite geometry

No sharp melting points

Page 6 of 6

126. 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

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

None of these

√P/d

P/d

P/√d

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

Number of isotopes

Charge

Relative abundance

Mass

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

Decrease of surface tension

Increase of K.E of molecules

Increase of intermolecular interactions

Increase in potential energy of molecules

130. Particles that most effects material properties

Protons

Valence electrons

Electrons

Neutrons

131. 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

132. 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

His blood pressure will increase

He will feel cool

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

He will feel warmth

133. Repeatable entity of a crystal structure is known as

Lattice

Crystal

Unit cell

Miller indices

134. Which of the following is isotropic

Graphite

Mercury

Brass

Borax

135. 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) + +¯

136. Which of the following has least mass?

1 mole of S

3 x 10²³ atoms of C

7.0 g of Ag.

2 gram atom of nitrogen

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

They are anisotropic

They melt over a range of temperature

There are rigid and in-compressible

There is no orderly arrangement of particles

138. Van der Waal’s forces exist in

Non-polar

All types of atoms and molecules

Covalent

Polar compounds

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

3.5 moles

1.5 moles

3 moles

10 moles

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

Monoclimic

Mexagonal

Trigonal

Triclimic

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

3200

4800

4400

1524

142. Triple point of water is

193 K

273 K

203 K

373 K

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

159 mm Hg.

159 torr

159 g/m³

159 g/Cm²

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

20.16

22.4

2.016

2.24

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

1.3 x 10¯²⁰ g

3.72 x 10¯²³ g

1.4 x 10¯²¹ g

5.01 x 10¯²¹ g

146. Which of the following substances is not amorphous?

Glass

Polymer

Rubber

Ag NO₃

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

Hexagonal manner

Tetrahedral manner

Altahydral manner

Square planner manner

148. 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

149. 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 evaporates more readily than C

A and B evaporates at the same rate

B evaporates less readily than C

150. Correct order of intermolecular forces

Gas = liquid = solid

Gas < liquid < solid

Liquid < gas < solid

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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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ECAT Chemistry Solids Test

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Chemistry Solids MCQS Online Test

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