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Question (31)

QN006592

During evaporation of salt solution, water changes into:

(A) Ice
(B) Solid salt
(C) Vapour
(D) Crystals

Correct Answer: C

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Question (32)

QN006593

Which of the following methods gives the purest form of solid from a solution?

(A) Evaporation
(B) Filtration
(C) Crystallization
(D) Sedimentation

Correct Answer: C

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Question (33)

QN006594

A liquid mixture contains compounds boiling at 56°C and 100°C. Which method is suitable?

(A) Sublimation
(B) Filtration
(C) Distillation
(D) Handpicking

Correct Answer: C

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Question (34)

QN006595

If two liquids boil at 78°C and 80°C, separation should be done by:

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

Correct Answer: C

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Question (35)

QN006596

In chromatography, the paper acts mainly as the:

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

Correct Answer: B

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Question (36)

QN006597

Which method is used in laboratories to separate mixtures of coloured chemicals?

(A) Paper chromatography
(B) Handpicking
(C) Winnowing
(D) Sieving

Correct Answer: A

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Question (37)

QN006598

A saturated solution contains 80 g solute at 60°C and only 50 g at 20°C. Crystals formed on cooling are:

(A) 20 g
(B) 25 g
(C) 30 g
(D) 40 g

Correct Answer: C

Explanation:

80 – 50 = 30 g

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Question (38)

QN006599

A mixture contains liquids boiling at 65°C and 120°C. Which liquid vaporizes first during distillation?

(A) 120°C liquid
(B) Both together
(C) 65°C liquid
(D) Neither

Correct Answer: C

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Question (39)

QN006600

During crystallization, heating is done mainly to:

(A) Freeze the solvent
(B) Increase solubility of solute
(C) Reduce purity
(D) Remove crystals immediately

Correct Answer: B

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Question (40)

QN006601

Which process can separate salt from a salt-water solution while also collecting pure water?

(A) Evaporation
(B) Distillation
(C) Filtration
(D) Sieving

Correct Answer: B

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Question (31)

During evaporation of salt solution, water changes into:

Explanation:

Link:

Question (32)

Which of the following methods gives the purest form of solid from a solution?

Explanation:

Link:

Question (33)

A liquid mixture contains compounds boiling at 56°C and 100°C. Which method is suitable?

Explanation:

Link:

Question (34)

If two liquids boil at 78°C and 80°C, separation should be done by:

Explanation:

Link:

Question (35)

In chromatography, the paper acts mainly as the:

Explanation:

Link:

Question (36)

Which method is used in laboratories to separate mixtures of coloured chemicals?

Explanation:

Link:

Question (37)

A saturated solution contains 80 g solute at 60°C and only 50 g at 20°C. Crystals formed on cooling are:

Explanation:

Link:

Question (38)

A mixture contains liquids boiling at 65°C and 120°C. Which liquid vaporizes first during distillation?

Explanation:

Link:

Question (39)

During crystallization, heating is done mainly to:

Explanation:

Link:

Question (40)

Which process can separate salt from a salt-water solution while also collecting pure water?

Explanation:

Link:

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