12th Chemistry weekly Test - 1 ( Solid State )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 1 ( Solid State )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The defect arising due to an ion occupying interstitial position is called

Schottky defect
Metal excess defect
Frenkel defect
Metal deficiency defect

Which of the following exists as covalent crystals in solid state?

phosphorus
sulphur
chlorine
silicon

Graphite is a good conductor of electricity due to the presence of____________

Lone pair of electrons
Free valence electrons
Cations
Anions

The fraction of total volume occupied by the atoms in a simple cubic is
\(\left( \cfrac { \pi }{ 4\sqrt { 2 } } \right) \)

\(\left( \cfrac { \pi }{ 6 } \right) \)

\(\left( \cfrac { \pi }{ 4 } \right) \)

\(\left( \cfrac { \pi }{ 3\sqrt { 2 } } \right) \)
A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be
\(\left( \cfrac { 100 }{ 0.414 } \right) \)

\(\left( \cfrac { 0.732 }{ 100 } \right) \)

100X0.414

\(\left( \cfrac { 0.414 }{ 100 } \right) \)

Assertion : monoclinic sulphur is an example of monoclinic crystal system
Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)

Both assertion and reason are true and reason is the correct explanation of assertion
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Both assertion and reason are false.

Solid CO₂ is an example of

Covalent solid
metallic solid
molecular solid
ionic solid

In a solid, the cation is missing from the lattice and is found in an interstital position. The defect is __________.

Metal excess
p type
Schottky
Frenkel

The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length oif the edge of the unit cell is

488.5pm
848.5pm
884.5pm
484.5pm

Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners) Q atom at body centre and R atom at the face centres. Identify formula of the compound.

PQR
PQR₂
PQR₃
P₃QR

The coordination number of each sphere in body centred cubic packing is __________.

Part - B

Generic 2 - Answer All Question

classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

Distinguish between.
Face - centred and body - centred unit cells.

A compound made up of two atoms X and Y has a face centred cubic arrangement. X is present in the coners and Y at the centre of each face. If one atom is missing from comer. What is the simplest formula of the compound.
Why do solids have a definite volume?

Distinguish between cubic and hexagonal unit cells.

What are primitive unit cells?

Part - C

Generic 3 - Answer All Question

Explain Schottky defect.

Calculate the number of atoms in a fcc unit cell

Inspite of long range order in the arrangement of particles, why are the crystals usually not perfect?

Why ionic crystals are hard and brittle?

Write the properties of ionic crystals.
Why are solids rigid?

Part - D

Generic 5 - Answer All Question

What are the general characteristics of solids?

What are molecular solids? Explain the types of molecular solids.

Explain the following:
Similarities and differences between metallic and ionic crystals.
Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.

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12th Chemistry weekly Test - 1 ( Solid State )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 1 ( Solid State )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

The defect arising due to an ion occupying interstitial position is called

Which of the following exists as covalent crystals in solid state?

Graphite is a good conductor of electricity due to the presence of____________

The fraction of total volume occupied by the atoms in a simple cubic is

A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

Assertion : monoclinic sulphur is an example of monoclinic crystal system Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)

Solid CO2 is an example of

In a solid, the cation is missing from the lattice and is found in an interstital position. The defect is __________.

The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length oif the edge of the unit cell is

Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners) Q atom at body centre and R atom at the face centres. Identify formula of the compound.

The coordination number of each sphere in body centred cubic packing is __________.

Part - B

Generic 2 - Answer All Question

classify the following solids a. P4 b. Brass c. diamond d. NaCl e. Iodine

Distinguish between. Face - centred and body - centred unit cells.

A compound made up of two atoms X and Y has a face centred cubic arrangement. X is present in the coners and Y at the centre of each face. If one atom is missing from comer. What is the simplest formula of the compound.

Why do solids have a definite volume?

Distinguish between cubic and hexagonal unit cells.

What are primitive unit cells?

Part - C

Generic 3 - Answer All Question

Explain Schottky defect.

Calculate the number of atoms in a fcc unit cell

Inspite of long range order in the arrangement of particles, why are the crystals usually not perfect?

Why ionic crystals are hard and brittle?

Write the properties of ionic crystals.

Why are solids rigid?

Part - D

Generic 5 - Answer All Question

What are the general characteristics of solids?

What are molecular solids? Explain the types of molecular solids.

Explain the following: Similarities and differences between metallic and ionic crystals.

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.

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Assertion : monoclinic sulphur is an example of monoclinic crystal system
Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)

Solid CO₂ is an example of

classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

Distinguish between.
Face - centred and body - centred unit cells.

Explain the following:
Similarities and differences between metallic and ionic crystals.