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Question (41)

QN006602

A chromatography experiment shows three coloured spots from one ink sample. This indicates that the ink:

(A) Is pure
(B) Contains three components
(C) Cannot dissolve in solvent
(D) Is a suspension

Correct Answer: B

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Question (42)

QN006603

Which method is based on repeated vaporization and condensation?

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

Correct Answer: B

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Question (43)

QN006604

If 240 g solute dissolves at 80°C and only 150 g dissolves at 30°C, the crystals formed on cooling are:

(A) 60 g
(B) 70 g
(C) 80 g
(D) 90 g

Correct Answer: D

Explanation:

240 – 150 = 90 g

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Question (44)

QN006605

Which separation method is useful for separating medicine components in laboratories?

(A) Chromatography
(B) Sedimentation
(C) Winnowing
(D) Handpicking

Correct Answer: A

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Question (45)

QN006606

In a distillation setup, the thermometer is used to measure:

(A) Room temperature
(B) Temperature of cooling water
(C) Boiling point of vapour
(D) Melting point of residue

Correct Answer: C

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Question (46)

QN006607

A student obtains crystals after cooling a hot concentrated solution. The process involved is:

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

Correct Answer: C

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Question (47)

QN006608

Which method separates components according to their attraction towards solvent and paper?

(A) Distillation
(B) Chromatography
(C) Evaporation
(D) Crystallization

Correct Answer: B

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Question (48)

QN006609

A solution contains liquids with boiling points 78°C and 150°C. Which method is most suitable?

(A) Simple distillation
(B) Sedimentation
(C) Filtration
(D) Sieving

Correct Answer: A

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Question (49)

QN006610

During fractional distillation, components with lower boiling points are collected:

(A) First
(B) Last
(C) Never
(D) Together with residue

Correct Answer: A

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Question (50)

QN006611

Which process is most suitable for separating dissolved impurities from copper sulfate crystals?

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

Correct Answer: C

Explanation:

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Question (41)

A chromatography experiment shows three coloured spots from one ink sample. This indicates that the ink:

Explanation:

Link:

Question (42)

Which method is based on repeated vaporization and condensation?

Explanation:

Link:

Question (43)

If 240 g solute dissolves at 80°C and only 150 g dissolves at 30°C, the crystals formed on cooling are:

Explanation:

Link:

Question (44)

Which separation method is useful for separating medicine components in laboratories?

Explanation:

Link:

Question (45)

In a distillation setup, the thermometer is used to measure:

Explanation:

Link:

Question (46)

A student obtains crystals after cooling a hot concentrated solution. The process involved is:

Explanation:

Link:

Question (47)

Which method separates components according to their attraction towards solvent and paper?

Explanation:

Link:

Question (48)

A solution contains liquids with boiling points 78°C and 150°C. Which method is most suitable?

Explanation:

Link:

Question (49)

During fractional distillation, components with lower boiling points are collected:

Explanation:

Link:

Question (50)

Which process is most suitable for separating dissolved impurities from copper sulfate crystals?

Explanation:

Link:

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