JAMB and WAEC Chemistry questions

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

All topics Acids, bases and salts · 58 Air · 37 Atomic structure and bonding · 59 Chemical combination · 58 Chemical equilibrium · 37 Chemistry and industry · 35 Electrolysis · 41 Energy changes · 38 Environmental pollution · 32 Kinetic theory of matter and gas laws · 45 Metals and their compounds · 47 Non-metals and their compounds · 45 Organic compounds · 72 Oxidation and reduction · 41 Rates of chemical reaction · 38 Separation of mixtures and purification · 42 Solubility · 36 Water · 39

Question 701· 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 702· 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 703· Separation of mixtures and purification· WAEC
The purity of a solid can be tested by finding its
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Answer: B. melting point
Explanation and discussion
Question 704· 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 705· 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 706· Separation of mixtures and purification· WAEC
Iodine can be separated from a mixture with sand by
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Answer: B. sublimation
Explanation and discussion
Question 707· 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 708· 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 709· 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 710· 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 711· 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 712· 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 713· Separation of mixtures and purification· WAEC
A mixture of iodine crystals and sand can best be separated by
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Answer: A. sublimation
Explanation and discussion
Question 714· 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 715· Separation of mixtures and purification· WAEC
A pure substance has
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Answer: B. a sharp, fixed melting point
Explanation and discussion
Question 716· Separation of mixtures and purification· WAEC
Which method recovers solid salt from brine collected at a salt lake?
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Answer: B. evaporation
Explanation and discussion
Question 717· Separation of mixtures and purification· WAEC
Iodine can be separated from sand by
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Answer: A. sublimation
Explanation and discussion
Question 718· 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 719· Separation of mixtures and purification· WAEC
Kerosene and water poured into one container form two layers. Which apparatus separates them most simply?
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Answer: D. separating funnel
Explanation and discussion
Question 720· 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

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JAMB and WAEC Chemistry questions

The apparatus shown is used to separate

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

The purity of a solid 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

Iodine can be separated from a mixture with sand by

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:

A mixture of iodine crystals and sand can best be separated by

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

A pure substance has

Which method recovers solid salt from brine collected at a salt lake?

Iodine can be separated from sand by

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

Kerosene and water poured into one container form two layers. Which apparatus separates them most simply?

Which of the following is a physical change?