Solution Test

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Solution Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

When KCI crystal is heated into the vapour of potassium which of the following is not the correct observation?

A
The crystal exhibits diamagnetic property.

B
Some of CI⁻ ions leave the lattice sites which are occupied by one electron each.

C
The crystal exhibits paramagnetic property.

D
The crystal acquires violet colour.

Solution

The crystal is paramagnetic due to the presence of unpaired electrons in the anion sites.
Question 2
1 / -0

Lead zirconate (PbZrO₃) crystal has its electric dipoles………and is called……………

A
Partially aligned on heating, pyro electric.

B
Partially aligned under mechanical stress, piezoelectric.

C
Spontaneously aligned in one direction, ferroelectric

D
Aligned in alternate directions, anti-ferroelectric.

Solution

Lead zirconate (PbZrO₃) crystal has its electric dipoles Aligned in alternate directions and is called anti-ferroelectric.
Question 3
1 / -0

When soap or detergent is added to water

A
Surface tension increases

B
Surface tension decreases

C
Surface tension remains unaffected

D
Surface tension may increases or decreases depending on the nature of soap or detergent

Solution

When soap or detergent is added to water Surface tension decreases.
Question 4
1 / -0

Surface energy of a liquid is

A
The work done to increase the surface area by unity

B
The force per unit length

C
None of these

D
The work done to decreases the surface area by unity

Solution

Surface energy of a liquid is the work done to increase the surface area by unity.
Question 5
1 / -0

The S.I. Units of surface tension and viscosity are respectively

A
dyne cm⁻²s, dyne cm⁻¹

B
Nm⁻¹, Nm⁻²s

C
Nm⁻²s, Nm⁻¹

D
dyne cm⁻¹, dyne cm⁻²s

Solution

S.I. Units of surface tension Nm⁻¹,and viscosity Nm⁻²s.
Question 6
1 / -0

A liquid usually supercools (fall of temperature below its freezing point without freezing) when cooled rapidly. However after some supercooling, temperature rises suddenly to the freezing point despite the cooling. nd the source of heat that causes the temperature to rise.

A
The enthalpy of transition

B
The enthalpy of freezing of the liquid

C
None of these

D
The enthalpy of fusion of the solid

Solution

When super cooled liquid starts freezing, latent of freezing (- latent heat of fusion of the solid) is evolved.
Question 7
1 / -0

In benzene the intermolecular forces are:

A
σ and π bonding

B
Hydrogen bonding

C
Dipole-dipole attractions

D
Dispersion forces

Solution

In benzene the intermolecular forces are dispersion forces.
Question 8
1 / -0

A mineral having the formula AB₂ crystallizes in ccp lattice with A atoms occupying the lattice points. Pick out the correct statements of the following

A
100% occupancy of tetrahedral voids, C.N. of B=4

B
100% occupancy of tetrahedral voids, C.N. of B=4

C
100% occupancy of tetrahedral voids, C.N. of A=4

D
50% occupancy of tetrahedral voids, C.N. of A=4

Solution

Number of A cations per unit cell =4

Number of B anions per unit cell must be = 2 ×4=8

Number of tetrahedral voids per unit cell = 2 × 4 = 8

Number of octahedral voids per unit all = 1 × 4 = 4.

Hence, occupancy of tetrahedral voids = 100%

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Solution Test - 4

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Question 1

The crystal exhibits diamagnetic property.

Some of CI− ions leave the lattice sites which are occupied by one electron each.

The crystal exhibits paramagnetic property.

The crystal acquires violet colour.

Solution

Question 2

Partially aligned on heating, pyro electric.

Partially aligned under mechanical stress, piezoelectric.

Spontaneously aligned in one direction, ferroelectric

Aligned in alternate directions, anti-ferroelectric.

Solution

Question 3

Surface tension increases

Surface tension decreases

Surface tension remains unaffected

Surface tension may increases or decreases depending on the nature of soap or detergent

Solution

Question 4

The work done to increase the surface area by unity

The force per unit length

None of these

The work done to decreases the surface area by unity

Solution

Question 5

dyne cm−2s, dyne cm−1

Nm−1, Nm−2s

Nm−2s, Nm−1

dyne cm−1, dyne cm−2s

Solution

Question 6

The enthalpy of transition

The enthalpy of freezing of the liquid

None of these

The enthalpy of fusion of the solid

Solution

Question 7

σ and π bonding

Hydrogen bonding

Dipole-dipole attractions

Dispersion forces

Solution

Question 8

100% occupancy of tetrahedral voids, C.N. of B=4

100% occupancy of tetrahedral voids, C.N. of B=4

100% occupancy of tetrahedral voids, C.N. of A=4

50% occupancy of tetrahedral voids, C.N. of A=4

Solution

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Some of CI⁻ ions leave the lattice sites which are occupied by one electron each.

dyne cm⁻²s, dyne cm⁻¹

Nm⁻¹, Nm⁻²s

Nm⁻²s, Nm⁻¹

dyne cm⁻¹, dyne cm⁻²s