Crystallisation

Q.

What is the process of crystallization?

Q.

How would you separate a mixture of salt and water ?

Q.

Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Q.

Define fractional crystallization.

Q.

Pure copper sulphate can be obtained from an impure sample by the process of :

(a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation

Q.

How will you separate a mixture of sodium chloride, ammonium chloride and sand?

Q.

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with a well-labeled diagram.

Q.

Explain how impure copper sulphate can be purified by crystallization.

Q.

A mixture of iron nails, salt, oil, and water is provided to you. Give stepwise methods to separate each component from this mixture.

Q.

Which of the following process will convert unsaturated solution into saturated solution?

1. Adding more solute to the solution.

2. Evaporation of solvent from the solution by heating.

3. By cooling down the temperature of the solution.

4. Both A and B

Q. What kind of mixtures can be separated by the process of crystallisation ?

Q.

Impure water can be purified by the process of .

Q.

Why does hot saturated solution of potassium nitrate forms crystal on cooling?

Q.

The best way to recover sugar from an aqueous sugar solution is :

(a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation

Q. In which phenomenon water changes into water vapour below its boiling point?

1. Boiling
2. Condensation
3. Crystallisation
4. Evaporation

Q.

Grease stains are removed from clothes by using ________.

Q.

Which method is better for recovering sugar from sugar solution, evaporation or crystallisation? Give the reason for your answer.

Q.

How can we recover pure sugar from sugar solutions?

1. by distillation

2. by filtration

3. by crystallization

4. by evaporation to dryness

Q. Equivalent weight of crystalline oxalic acid is

Q.

Hot saturated solution of sodium nitrate forms crystals, as it cools. Why

Q.

Which method is used to obtain distilled water from the salt solution?

1. Evaporation

2. Distillation

3. Filtration

Q.

(a) Define

(i) Henry's law

(ii) Crystallization.

(b) State the different methods of crystallization.

Q.

Name the process which can be used to purify an impure sample of copper sulphate.

Q.

To separate a mixture of iron fillings, sulphur powder and iron sulphide, which sequence of methods can be used ?

1. Magnet, dissolve in ${\mathrm{CS}}_2$, filter, evaporation

2. magnet, dissolve in water, filter, evaporation

3. dissolve in water, filter, crystallize, decant

4. magnet, filter, decant, crystallize.

Q.

Separation of crystals of alum from an impure sample is carried out through:

1. Centrifugation

2. Distillation

3. Crystallization

4. None of the above.

Q.

How can we separate amonia acid from fruit juice

Q. Crystallization is a process of :

1. cooling a hot concentrated solution of a substance to obtain beads
2. cooling a hot concentrated solution of a substance to obtain crystals
3. heating a solution to obtain beads
4. all of the above

Q. Question 40
You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture?

Q.

How will you separate a mixture of iron nails, common salt, and camphor ?

Q. What type of mixture is seperated by crystallization? Why is it preferred over evaporation?