JAMB Chemistry questions

443 questions with answers and explanations. Tap an option to check yourself.

All topics Acids, bases and salts · 32 Air · 21 Atomic structure and bonding · 33 Chemical combination · 31 Chemical equilibrium · 21 Chemistry and industry · 18 Electrolysis · 22 Energy changes · 22 Environmental pollution · 17 Kinetic theory of matter and gas laws · 27 Metals and their compounds · 24 Non-metals and their compounds · 23 Organic compounds · 43 Oxidation and reduction · 22 Rates of chemical reaction · 22 Separation of mixtures and purification · 24 Solubility · 20 Water · 21

Question 381· Separation of mixtures and purification· JAMB
A pure solid can be identified by its
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Answer: A. sharp melting point
Explanation and discussion
Question 382· Separation of mixtures and purification· JAMB
A mixture of iodine crystals and sand is best separated by
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Answer: C. sublimation
Explanation and discussion
Question 383· Separation of mixtures and purification· JAMB
Which method is best for obtaining pure water from sea water?
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Answer: C. distillation
Explanation and discussion
Question 384· Separation of mixtures and purification· JAMB
Blue copper(II) tetraoxosulphate(VI) crystals are obtained by crystallisation rather than by evaporating to dryness because
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Answer: C. evaporating to dryness would drive off the water of crystallisation
Explanation and discussion
Question 385· Separation of mixtures and purification· JAMB
Steam distillation is used to separate substances that are
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Answer: C. immiscible with water and decompose at their boiling points
Explanation and discussion
Question 386· Separation of mixtures and purification· JAMB
A pure liquid can be identified by its
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Answer: C. constant boiling point
Explanation and discussion
Question 387· Separation of mixtures and purification· JAMB
The apparatus shown is used to separate
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Answer: B. two immiscible liquids, such as kerosene and water
Explanation and discussion
Question 388· Separation of mixtures and purification· JAMB
The purity of a solid sample can be tested by finding its
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Answer: C. melting point
Explanation and discussion
Question 389· Separation of mixtures and purification· JAMB
A mixture of ammonium chloride and sodium chloride is best separated by
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Answer: B. sublimation
Explanation and discussion
Question 390· Separation of mixtures and purification· JAMB
Two spots that travel the same distance on a chromatogram under the same conditions are probably
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Answer: C. the same substance
Explanation and discussion
Question 391· Separation of mixtures and purification· JAMB
Centrifugation is used to separate
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Answer: B. very fine solid particles from a liquid quickly
Explanation and discussion
Question 392· Separation of mixtures and purification· JAMB
Two immiscible liquids such as oil and water are separated with a
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Answer: D. separating funnel
Explanation and discussion
Question 393· Separation of mixtures and purification· JAMB
The chromatogram shows a mixture X and three pure dyes P, Q and R. Mixture X contains
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Answer: A. P and R
Explanation and discussion
Question 394· Separation of mixtures and purification· JAMB
The coloured components of ink are best separated by
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Answer: D. paper chromatography
Explanation and discussion
Question 395· Separation of mixtures and purification· JAMB
Which method is most suitable for separating a mixture of sand and salt?
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Answer: D. dissolving, filtration and evaporation
Explanation and discussion
Question 396· Separation of mixtures and purification· JAMB
Chromatography separates components of a mixture on the basis of their:
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Answer: A. rates of movement through a medium
Explanation and discussion
Question 397· Separation of mixtures and purification· JAMB
In fractional distillation, the liquid that distils over first is the one with the
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Answer: C. lowest boiling point
Explanation and discussion
Question 398· Separation of mixtures and purification· JAMB
A mixture of iron filings and sulphur powder is best separated by
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Answer: A. using a magnet
Explanation and discussion
Question 399· Separation of mixtures and purification· JAMB
Which of the following is a physical change?
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Answer: D. dissolving sugar in water
Explanation and discussion
Question 400· Separation of mixtures and purification· JAMB
The components of liquid air are separated by fractional distillation because they have different
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Answer: D. boiling points
Explanation and discussion

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JAMB Chemistry questions

A pure solid can be identified by its

A mixture of iodine crystals and sand is best separated by

Which method is best for obtaining pure water from sea water?

Blue copper(II) tetraoxosulphate(VI) crystals are obtained by crystallisation rather than by evaporating to dryness because

Steam distillation is used to separate substances that are

A pure liquid can be identified by its

The apparatus shown is used to separate

The purity of a solid sample can be tested by finding its

A mixture of ammonium chloride and sodium chloride is best separated by

Two spots that travel the same distance on a chromatogram under the same conditions are probably

Centrifugation is used to separate

Two immiscible liquids such as oil and water are separated with a

The chromatogram shows a mixture X and three pure dyes P, Q and R. Mixture X contains

The coloured components of ink are best separated by

Which method is most suitable for separating a mixture of sand and salt?

Chromatography separates components of a mixture on the basis of their:

In fractional distillation, the liquid that distils over first is the one with the

A mixture of iron filings and sulphur powder is best separated by

Which of the following is a physical change?

The components of liquid air are separated by fractional distillation because they have different