Liquefaction,Solvent Extraction,Gravitation

Q.

Which method can be used to separate petrol and water from their mixture?

1. Gravitation

2. Evaporation

3. Condensation

4. Sieving

Q.

Assertion (A): Compounds are invariably homogeneous.

Reason (R): Compounds are constituted of only one kind of molecule distributed uniformly.

1. Both A and R are true and R is the correct explanation of A.

2. Both A and R are true, but R is not the correct explanation of A.

3. A is true and R is false.

4. A is false and R is true.

Q.

16 (b). Answer the following in brief:

How will you separate a mixture of sand, salt and iron?

Q.

Which method is employed in the separation of potassium nitrate and common salt?

1. Gravitation

2. Fractional crystallization

3. Sublimation

4. Solvent extraction

Q.

Assertion: A liquid-gas mixture is separated by boiling.

Reason: The solubility of a gas in a liquid decreases with increase in temperature.

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

2. Assertion and reason are correct, but reason is not the correct explanation of assertion.

3. Assertion is correct, but reason is incorrect.

4. Assertion is incorrect, but reason is correct.