Solid State Test

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Solid State Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The three states of matter are solid, liquid and gas. Which of the following statement is/are true about them?

A
Gases and liquids have viscosity as a common property

B
The molecules in all the three states possess random translational motion

C
Gases cannot be converted into solids without passing through the liquid phase

D
Solids and liquids have vapour pressure as a common property

Solution

Both gases and liquids possess fluidity and hence viscosity, molecules in the solid state do not have translational motion.
Question 2
1 / -0

A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely disappears. This behavior is the characteristic of substances forming

A
Isomeric crystals

B
Liquid crystals

C
Isomorphous crystals

D
Allotropic crystals

Solution

It is a characteristic of liquid crystal.
Question 3
1 / -0

Which of the following is ferroelectric compound?

A
BaTiO₃

B
K₄[Fe(CN)₆]

C
Pb₂O₃

D
PbZrO₃

Solution

BaTiO₃ is a ferroelectric compound.
Question 4
1 / -0

Value of heat of fusion of NaCl is

A
Very low

B
Very high

C
Not very low and not very high

D
None of the above

Solution

The value of heat of fusion of NaCl is very high due to fcc arrangement of its ions.

Fcc (Face centre cube)
Question 5
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NaCl is an example of

A
Covalent solid

B
Ionic solid

C
Molecular solid

D
Metallic solid

Solution

NaCl is an ionic solid in which constituent particles are positive (Na⁺) and negative (Cl⁻) ions.
Question 6
1 / -0

To get an n- type semiconductor, the impurity to be added to silicon should have which of the following number of valence electrons.

A
1

B
2

C
3

D
5

Solution

For n-type, impurity added to silicon should have more than 4 valence electrons. These impurities are mostly from 15-group elements like P and As.
Question 7
1 / -0

Glass is

A
Cooled liquid

B
Crystalline solid

C
Amorphous solid

D
Liquid crystal

Solution

Amorphous solids neither have ordered arrangement (i.e. no definite shape) nor have sharp melting point like crystals, but when heated, they become pliable until they assume the properties usually related to liquids.

It is therefore they are regarded as super-cooled liquids.
Question 8
1 / -0

The formula for determination of density of unit cell is

A
a³ × N_o/N × Mgcm⁻³

B
N × M/a³ × N_ogcm⁻³

C
a³ × N_o/N × Mgcm⁻²

D
a³× N_o/N × Mgcm⁻²

Solution

Density of unit cell = N × mol.wt.(M)/V(= a³) × avogadro no.(N_o) gcm⁻³
Question 9
1 / -0

If the value of ionic radius ratio (r_c/r_a) is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is

A
Tetrahedral

B
Planar

C
Octahedral

D
Pyramidal

Solution

The value of ionic radius ratio is 0.52 which is between 0.414−0.732, and then the geometrical arrangement of ions in crystal is octahedral.

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Solid State Test - 8

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Solid State Test - 8

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Question 1

Gases and liquids have viscosity as a common property

The molecules in all the three states possess random translational motion

Gases cannot be converted into solids without passing through the liquid phase

Solids and liquids have vapour pressure as a common property

Solution

Question 2

Isomeric crystals

Liquid crystals

Isomorphous crystals

Allotropic crystals

Solution

Question 3

BaTiO3

K4[Fe(CN)6]

Pb2O3

PbZrO3

Solution

Question 4

Very low

Very high

Not very low and not very high

None of the above

Solution

Question 5

Covalent solid

Ionic solid

Molecular solid

Metallic solid

Solution

Question 6

1

2

3

5

Solution

Question 7

Cooled liquid

Crystalline solid

Amorphous solid

Liquid crystal

Solution

Question 8

a3 × No/N × Mgcm−3

N × M/a3 × Nogcm−3

a3 × No/N × Mgcm−2

a3 × No/N × Mgcm−2

Solution

Question 9

Tetrahedral

Planar

Octahedral

Pyramidal

Solution

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BaTiO₃

K₄[Fe(CN)₆]

Pb₂O₃

PbZrO₃

a³ × N_o/N × Mgcm⁻³

N × M/a³ × N_ogcm⁻³

a³ × N_o/N × Mgcm⁻²

a³× N_o/N × Mgcm⁻²