Rate of crystallisation does not depend upon the

Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

A

Glycerol

B

Nitro cellulose

C

Camphor

D

None of these

During crystallisation, formation of crystal can occur in __________ solution only.

A

Saturated

B

Supersaturated

C

Undersaturated

D

All of the above

The driving potential for the crystal growth during crystallisation is the __________ of the solution.

A

Concentration

B

Viscosity

C

Super-saturation

D

Density

In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is

A

More

B

Less

C

Same

D

More or less; depends on the nature of solution

Crystallisation of solids from a homogeneous solution is a/an __________ process.

A

Exothermic

B

Mildly endothermic

C

Highly endothermic

D

None of these

The crystallisation of a solute from a solution may be done by

A

Removal of pure solvent by evaporation

B

Change of temperature thereby causing supersaturation

C

Changing the nature of the system by the addition of a more soluble material

D

All of the above

The reverse process of fractional crystallisation is called

A

Stripping

B

Leaching

C

Differential distillation

D

Absorption

The rate of emission of radiation by a body does not depend upon the

A

Wavelength of radiation

B

Surface temperature of the body

C

Nature of the surface

D

Shape and porosity of the body

Filtration rate does not depend upon the

A

Pressure drop & area of filtering surface

B

Resistance of the cake & the septum

C

Properties of the cake & the filtrate

D

None of these

Heat transfer rate to the stock/charge in the furnace does not depend upon the

A

Emissivity of the refactory walls

B

Size of the furance

C

Use of waste heat recovery equipments

D

Thickness of the stock

Rate of crystallisation does not depend upon the

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