Crystallization

Question 1

Which of the following is not a common method used for purification?
a) Sublimation
b) Crystallisation
c) Electrolysis
d) Chromatography

Answer 1

c) Electrolysis

Question 2

Crystallisation is based on the ____________
a) Difference in melting point
b) Difference in boiling point
c) Difference in pressure
d) Difference in solubility

Answer 2

d) Difference in solubility

Question 3

Which of the following is the example of crystallisation process?
a) Purification of alum
b) Purification of sea water
c) Separation of gases from air
d) None of the mentioned

Answer 3

a) Purification of alum

Question 4

At room temperature, the impure compound in crystallisation is ____________
a) Soluble
b) Sparingly soluble
c) Insoluble
d) None of the mentioned

Answer 4

b) Sparingly soluble

Question 5

Which of the following is known as mother liquor?
a) Solvent
b) Solute
c) Solution
d) Filtrate

Answer 5

d) Filtrate

Question 6

The solution of impure compound and solvent is concentrated to get
____________
a) Unsaturated solution
b) Undersaturaed solution
c) Saturated solution
d) Oversaturated solution

Answer 6

c) Saturated solution

Question 7

Insoluble impurities from solution during crystallization are removed by
____________
a) Drying
b) Filtration
c) Heating
d) Cooling

Answer 7

b) Filtration

Question 8

The solution which is obtained after filtration is ____________
a) Suspended solution
b) Clear solution
c) Colloidal solution
d) None of the mentioned

Answer 8

b) Clear solution

Question 9

Crystal phases can be inter-converted by varying ____________
a) Temperature
b) Pressure
c) Size
d) Viscosity

Answer 9

a) Temperature

Question 10

The nature of the crystallization process is governed by _____________
a) Thermodynamics
b) Kinetic factors
c) Thermodynamics and Kinetic factors
d) None of the mentioned

Answer 10

c) Thermodynamics and Kinetic factors