Need for Separation of Mixtures

Q. Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

1. Only (i) and (ii) are correct
2. Only (ii) and (iii) are correct
3. Only (i) and (iii) are correct
4. (i), (ii) and (iii), all are correct

Q. _____ is the technique used to separate salt from seawater.

1. Distillation
2. Filtration
3. Decantation

4. Crystallization

Q.

Name the method for separation of saw dust from the mixture of saw dust and salt

Q.

Separation is done to obtain useful components from a mixture.

True/False

1. True

2. False

Q. The correct order of the products collected from the fractional distillation column from top to bottom is:

1. Petroleum gas, petrol, kerosene and bitumen.
2. Petrol, petroleum gas, kerosene and bitumen.
3. Petroleum gas, kerosene, petrol, and bitumen.
4. Petrol, kerosene, petroleum gas and bitumen.

Q.

The mixture of sand and camphor is purified by:

1. Separating funnel

2. Distillation

3. Cooling

4. Sublimation

Q.

In churning milk, the need for churning out butter is to ________.

1. To obatin milk.

2. To get two useful components.

3. To add impurity.

4. To remove impurities.

Q.

Which of the following can be separated using a funnel?

1. Water and salt

2. water and petrol

3. water and oil

4. water and alcohol

Q.

How will you separate impure sample of common salt containing some chalk?

Q. Crude oil can be separated into petrol, diesel, kerosene, wax, etc.

1. True
2. False

Q.

When a mixture of these four liquids is taken how can they be separated? Justify.

Q. 47. How can separate crude oil from kerosene oil

Q. Column II gives the method to separate phases mentioned in column I. Match them and select the correct answer from the codes given below.

Column I	Column II
(a) Miscible liquids	(p) Distillation
(b) Immiscible liquids	(q) Crystallization
(c) Pure copper sulfate from an impure sample	(r) Sublimation
(d) Salt and ammonium chloride	(s) Separating funnel

1. (a) - (p), (b) - (s), (c) - (q), (d) - (r)
2. (a) - (r), (b) - (s), (c) - (p), (d) - (q)
3. (a) - (r), (b) - (s), (c) - (q), (d) - (p)
4. (a) - (q), (b) - (s), (c) - (p), (d) - (r)

Q. Assertion :Components of a homogeneous mixture cannot be separated by using physical methods. Reason: Composition of homogeneous mixture is uniform throughout as the components react to form a single compound.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. We need to separate different components of the mixture:

1. to obtain pure substance
2. all of these
3. to separate components for further uses
4. to remove the impurities

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> How can we separate a mixture of two immiscible liquids?

Q.

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

Q.

Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

1. Only (i) and (ii) are correct

2. Only (ii) and (iii) are correct

3. (i), (ii) and (iii), all are correct

4. Only (i) and (iii) are correct

Q. Two immiscible liquids can be separated by using:

1. filter funnel
2. can not be separated
3. evaporation disc
4. separating funnel

Q. Mixtures on separation can give ____________.

1. elements
2. compounds
3. both elements and compounds
4. impure substances

Q.

Crude oil contains:

1. Petroleum gas, petrol, and coal.

2. Petroleum gas, petrol and diesel.

3. Petroleum gas, diesel and lubricating oils.

4. Natural gas, kerosene and lubricating oils.

Q. The purpose of separating the components of a mixture is :

1. Separation makes it possible to study and use the individual components of a mixture.
2. It is helpful in removing any harmful or undesirable constituents.
3. It is helpful in obtaining a pure sample of a substance.
4. All of the above.

Q. Seawater can be separated in order to obtain pure substances like salt and water.

1. true
2. false

Q. Separation of a mixture help us to obtain desirable components.

1. True
2. False

Q. Why are symbols and formulae of substances important?

Q. Identify the examples of separation of substances:

1. separation of milk or curd to remove butter
2. separation of stalks from grains
3. separation of dirt particle from water
4. all of these

Q. Stones found among grains are separated by handpicking.

1. True
2. False

Q. Substances are separated, because the :

1. harmful substance can be removed
2. non-useful substance can be removed
3. useful substance, which we require separately
4. All of these

Q. A salt is made by adding an excess of an insoluble metal oxide to an acid. How is the excess metal oxide removed from the mixture?

1. chromatography
2. filtration
3. crystallisation
4. distillation

Q.

Why do we separate substances in a mixture?

i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.

1. Only (i) and (ii) are correct

2. Only (ii) and (iii) are correct

3. Only (i) and (iii) are correct

4. (i), (ii) and (iii), all are correct