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Question (11)

QN006572

Fractional distillation is used when boiling points differ by:

(A) More than 100°C
(B) Less than 25°C
(C) Exactly 50°C
(D) More than 200°C

Correct Answer: B

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Question (12)

QN006573

Fractional distillation of petroleum produces different fractions because components have different:

(A) Colours
(B) Densities
(C) Boiling points
(D) Solubilities

Correct Answer: C

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Question (13)

QN006574

Which petroleum fraction is collected near the top of the fractionating column?

(A) Bitumen
(B) Diesel
(C) Petroleum gas
(D) Lubricating oil

Correct Answer: C

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Question (14)

QN006575

Which technique separates coloured substances based on their movement on paper?

(A) Distillation
(B) Filtration
(C) Paper chromatography
(D) Sublimation

Correct Answer: C

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Question (15)

QN006576

The word chromatography means:

(A) Writing with colour
(B) Heating with light
(C) Splitting crystals
(D) Vapour formation

Correct Answer: A

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Question (16)

QN006577

In paper chromatography, the solvent used is called the:

(A) Stationary phase
(B) Mobile phase
(C) Residue
(D) Solute

Correct Answer: B

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Question (17)

QN006578

In paper chromatography, substances separate because they have different:

(A) Masses
(B) Colours
(C) Rates of movement
(D) Shapes

Correct Answer: C

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Question (18)

QN006579

During chromatography, the solvent level should be:

(A) Above sample spot
(B) Equal to sample spot
(C) Below sample spot
(D) At top edge of paper

Correct Answer: C

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Question (19)

QN006580

Which method can be used to check adulteration in food colours?

(A) Sublimation
(B) Distillation
(C) Paper chromatography
(D) Crystallization

Correct Answer: C

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Question (20)

QN006581

A mixture of alcohol and water is best separated by:

(A) Filtration
(B) Fractional distillation
(C) Sedimentation
(D) Sublimation

Correct Answer: B

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Question (11)

Fractional distillation is used when boiling points differ by:

Explanation:

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Question (12)

Fractional distillation of petroleum produces different fractions because components have different:

Explanation:

Link:

Question (13)

Which petroleum fraction is collected near the top of the fractionating column?

Explanation:

Link:

Question (14)

Which technique separates coloured substances based on their movement on paper?

Explanation:

Link:

Question (15)

The word chromatography means:

Explanation:

Link:

Question (16)

In paper chromatography, the solvent used is called the:

Explanation:

Link:

Question (17)

In paper chromatography, substances separate because they have different:

Explanation:

Link:

Question (18)

During chromatography, the solvent level should be:

Explanation:

Link:

Question (19)

Which method can be used to check adulteration in food colours?

Explanation:

Link:

Question (20)

A mixture of alcohol and water is best separated by:

Explanation:

Link:

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