Crystallisation

Q.

In which solvent does naphthalene dissolve?

Q. Crystallisation is a chemical change.

1. True
2. False

Q.

What type of mixtures are separated by the technique of crystallisation?

Q.

Mixture of salt and ammonium chloride can be separated by the crystallisation process.

1. False

2. True

Q.

Crystals of copper sulphate are prepared by the method of:

1. Melting

2. Evaporation

3. Solidification

4. Crystallisation

Q. Describe how crystals of copper sulphate are prepared

Q.

Name the suitable solvent for the following substance: Rubber

Q.

Slaking of lime is which change

Q.

How to separate a mixture of sand, salt, water, oil, iron filings

Q.

What is the purpose of an inert solvent?

Q. How to obtain pure copper sulphate
crystals?

Q.

Crystallisation of copper sulphate is a physical change.

1. True

2. False

Q. How to make crystal of salt

Q.

Describe Immobilized Solvents.

Q. Is removing of water from compounds like CuSO_​​​4​​·10H₂O a physical or chemical change?

Q.

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

Condensation of steam is not a chemical change.

1. True
2. False

Q.

Assertion: Phenolphthalein is an acid-base indicator.
Reason: In an acid-base titration, this indicator is used.

1. Assertion and reason are true and the reason is the correct explanation of assertion

2. Both assertion and reason are true but the reason is not the correct explanation of assertion

3. The assertion is true but the reason is false.

4. Both assertion and reason are false.

Q.

Explain the following:

1) Galvanization

2) Crystallization [2 MARKS]

Q. ___ is the property of solid, liquid, or gaseous chemical substances called solute by virtue of which they dissolve in a solid, liquid, or gaseous solvent.

1. Both a & c

2. Solubility

3. Specific heat

4. Dielectric constant

Q. Which of the following mixtures are separated using crystallisation?

1. Oil and water
2. Urea and water
3. Sugar and water
4. Sand and water

Q.

How can you show curdling of milk is a chemical change?

Q.

A good method to separate alum (phitkari) from impure samples is:

1. Filtration

2. Sedimentation

3. Sublimation

4. Crystallization

Q.

Ram wants to separate salt from seawater. He evaporates sea water to obtain salt from it but the salt obtained is impure. Which of the following process will he use to obtain pure crystals of salt?

1. Crystallization

2. Fusion

3. Sublimation

4. Solidification

Q.

How is impure copper sulphate purified by the process of crystallization?

Q. Question 8
Describe how crystals of copper sulphate are prepared.

Q.

Is the pure milk that we get , really pure ? Justify answer

Q. How can we separate sugar from its sugar solution?

1. Evaporation
2. Crystallization
3. Filtration
4. Decantation

Q.

Name the method for separation of following :

Mixture of two solids, both have different solubilities in the same solvent.

Q.

_____ is a process that separates a pure solid in the form of its crystals from a solution.

1. Phase change

2. Filtering

3. Solidification

4. Crystallisation

Q. Seas and oceans contain saline water. Which amongst the following processes can be used to obtain salt from it?

1. Decantation
2. Filtration
3. Crystallisation
4. Sedimentation