ICSE Class 12 Chemistry by Pavan | Practice Test to Test Your Knowledge
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ICSE Class 12 Chemistry

ICSE Class 12 Chemistry

Complete mock test including Organic Chemistry, Chemical Bonding, Electrochemistry, and Chemical Kinetics. Includes multiple choice questions, short answers, and long descriptive questions.

2025-07-19
Pavan Pavan
ICSE Class 12 Chemistry Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

What is the primary difference between crystalline and amorphous solids?

A
Crystalline solids have a regular arrangement of particles, while amorphous solids do not.
B
Amorphous solids have a regular arrangement of particles, while crystalline solids do not.
C
Crystalline solids can be melted easily, whereas amorphous solids cannot.
D
Amorphous solids do not have any definite shape, while crystalline solids do.

What is the unit cell of a crystalline solid?

A
The smallest repeating unit that shows the complete symmetry of the crystal
B
The entire crystal structure
C
The arrangement of ions in a molecule
D
A section of the crystal with only one type of atom

What is the packing efficiency of a simple cubic unit cell (scc)?

A
52.4%
B
74%
C
100%
D
60.8%

Which of the following unit cells is known for the closest packing?

A
Face-centered cubic (FCC)
B
Simple cubic
C
Body-centered cubic (BCC)
D
Hexagonal close-packed (HCP)

In the FCC unit cell, how many atoms are there per unit cell?

A
4
B
2
C
1
D
6

What is the packing efficiency of a face-centered cubic (FCC) unit cell?

A
74%
B
52.4%
C
100%
D
60.8%

How many atoms are present in a body-centered cubic (BCC) unit cell?

A
2
B
1
C
4
D
6

What is the number of atoms per unit cell in a simple cubic lattice?

A
1
B
2
C
4
D
6

What is the relationship between the radius of atoms and edge length in an FCC unit cell?

A
Edge length = √2 × radius
B
Edge length = √3 × radius
C
Edge length = √4 × radius
D
Edge length = 2 × radius

How do you calculate the density of a unit cell?

A
Density = (Z × M) / (N × V)
B
Density = (Z × M) / (L × A)
C
Density = (Z × N) / (M × V)
D
Density = (M × V) / (Z × N)

What is the relationship between the radius of atoms and edge length in a body-centered cubic (BCC) unit cell?

A
Edge length = 4√3 × radius
B
Edge length = √2 × radius
C
Edge length = √3 × radius
D
Edge length = 2 × radius

What are point defects in solids?

A
Dislocations in the crystal lattice
B
Irregularities in the atomic arrangement
C
Atoms arranged in a periodic pattern
D
Electrons moving through the lattice

Which of the following is an example of a point defect?

A
F-centres
B
Substitutional defects
C
Grain boundaries
D
Dislocations

Which of the following is a characteristic of ionic solids?

A
High melting points and electrical conductivity in molten state
B
Good electrical conductivity in the solid state
C
They are malleable and ductile
D
They are soft and have low melting points

Which of the following is an example of a metallic solid?

A
Copper (Cu)
B
Sodium chloride (NaCl)
C
Diamond (C)
D
Graphite (C)

What type of bonding is present in diamond?

A
Covalent bonding
B
Ionic bonding
C
Metallic bonding
D
Hydrogen bonding

Which of the following is true for semiconductors?

A
They conduct electricity only at high temperatures
B
They have no free electrons
C
They conduct electricity in both the solid and molten states
D
They have a high electrical conductivity at low temperatures

What is the cause of piezoelectricity?

A
The distortion of the crystal lattice under mechanical stress
B
The flow of charge through a conductor
C
The movement of free electrons in a material
D
The interaction of light with a material

What is the magnetic property of a ferromagnetic substance?

A
It has a strong and permanent magnetic moment
B
It has a weak magnetic moment
C
It does not exhibit magnetism
D
It is attracted to magnetic fields but does not retain magnetism

Which of the following materials is diamagnetic?

A
Bismuth
B
Iron
C
Nickel
D
Cobalt

What type of magnetic behavior is shown by paramagnetic substances?

A
Weakly attracted to magnetic fields
B
Strongly repelled by magnetic fields
C
Exhibit a permanent magnetic moment
D
Do not interact with magnetic fields

Which of the following is an example of a nonstoichiometric defect?

A
F-centres
B
Substitutional defects
C
Interstitial defects
D
Vacancy defects

What is the reason for the occurrence of an F-centre defect?

A
Trapping of electrons in anionic vacancies
B
Displacement of ions in the crystal lattice
C
Absence of electrons in the lattice
D
Presence of impurity ions in the lattice

Which of the following magnetic materials is used in the construction of permanent magnets?

A
Ferromagnetic materials
B
Paramagnetic materials
C
Diamagnetic materials
D
Antiferromagnetic materials

Which type of semiconductor is formed by doping with elements that have fewer valence electrons than the host?

A
P-type semiconductor
B
N-type semiconductor
C
Intrinsic semiconductor
D
Extrinsic semiconductor

What is the role of 'n-type' doping in semiconductors?

A
It increases the number of free electrons in the material
B
It decreases the number of free electrons in the material
C
It increases the number of holes in the material
D
It increases the energy band gap

Which of the following materials is a good conductor of electricity?

A
Copper
B
Silicon
C
Glass
D
Rubber

What is the characteristic property of ferromagnetic substances?

A
They have a strong permanent magnetic moment
B
They are weakly attracted by magnetic fields
C
They do not exhibit magnetic behavior
D
They have no net magnetization

Which type of magnetic behavior is shown by materials like iron?

A
Ferromagnetic
B
Paramagnetic
C
Diamagnetic
D
Antiferromagnetic

Which of the following is an example of a diamagnetic material?

A
Bismuth
B
Iron
C
Nickel
D
Cobalt