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Question (21)

QN006482

Acetone can be separated from water by distillation because acetone:

(A) Is insoluble in water
(B) Has lower boiling point
(C) Is heavier than water
(D) Is coloured

Correct Answer: B

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Question (22)

QN006483

Fractional distillation is used when boiling point difference is:

(A) Very high
(B) Less than 25°C
(C) Exactly 100°C
(D) More than 200°C

Correct Answer: B

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Question (23)

QN006484

Which petroleum product is obtained at the top during fractional distillation due to lowest boiling point?

(A) Diesel
(B) Bitumen
(C) Petrol
(D) Petroleum gas

Correct Answer: D

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Question (24)

QN006485

Paper chromatography separates substances based on differences in their:

(A) Density only
(B) Colour only
(C) Rates of movement on paper
(D) Melting points

Correct Answer: C

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Question (25)

QN006486

In paper chromatography, the solvent level should initially be:

(A) Above the ink spot
(B) Equal to the ink spot
(C) Below the ink spot
(D) At top of paper

Correct Answer: C

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Question (26)

QN006487

The word chromatography means:

(A) Separation of gases
(B) Writing with colour
(C) Formation of crystals
(D) Heating liquids

Correct Answer: B

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Question (27)

QN006488

Which apparatus is used to separate immiscible liquids?

(A) Test tube
(B) Separating funnel
(C) Condenser
(D) China dish

Correct Answer: B

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Question (28)

QN006489

In a separating funnel containing mustard oil and water, mustard oil forms the upper layer because it is:

(A) More viscous
(B) Less dense
(C) More soluble
(D) Colourless

Correct Answer: B

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Question (29)

QN006490

Which process involves direct conversion of solid into vapour without becoming liquid?

(A) Condensation
(B) Deposition
(C) Sublimation
(D) Evaporation

Correct Answer: C

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Question (30)

QN006491

Which substance can be separated from sand by sublimation?

(A) Salt
(B) Sugar
(C) Camphor
(D) Chalk powder

Correct Answer: C

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Question (21)

Acetone can be separated from water by distillation because acetone:

Explanation:

Link:

Question (22)

Fractional distillation is used when boiling point difference is:

Explanation:

Link:

Question (23)

Which petroleum product is obtained at the top during fractional distillation due to lowest boiling point?

Explanation:

Link:

Question (24)

Paper chromatography separates substances based on differences in their:

Explanation:

Link:

Question (25)

In paper chromatography, the solvent level should initially be:

Explanation:

Link:

Question (26)

The word chromatography means:

Explanation:

Link:

Question (27)

Which apparatus is used to separate immiscible liquids?

Explanation:

Link:

Question (28)

In a separating funnel containing mustard oil and water, mustard oil forms the upper layer because it is:

Explanation:

Link:

Question (29)

Which process involves direct conversion of solid into vapour without becoming liquid?

Explanation:

Link:

Question (30)

Which substance can be separated from sand by sublimation?

Explanation:

Link:

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