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 681· Rates of chemical reaction· JAMB
Which of the following does NOT increase the rate of a reaction?
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Answer: B. using a larger lump of solid instead of powder
Explanation and discussion
Question 682· Rates of chemical reaction· WAEC
Increasing the temperature increases the rate of a reaction mainly because
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Answer: D. more particles have enough energy to react
Explanation and discussion
Question 683· Rates of chemical reaction· WAEC
Food preservatives work mainly by
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Answer: D. slowing down the reactions that spoil food
Explanation and discussion
Question 684· Separation of mixtures and purification· JAMB
Ethanol (boiling point 78 °C) can be separated from water by
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Answer: A. fractional distillation
Explanation and discussion
Question 685· Separation of mixtures and purification· WAEC
The liquid that passes through the filter paper during filtration is the
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Answer: A. filtrate
Explanation and discussion
Question 686· Separation of mixtures and purification· WAEC
A mixture of ammonium chloride and sodium chloride is separated by
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Answer: C. sublimation
Explanation and discussion
Question 687· Separation of mixtures and purification· WAEC
A mixture of chalk and water is separated by
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Answer: A. filtration
Explanation and discussion
Question 688· Separation of mixtures and purification· WAEC
In paper chromatography of a black ink, the component that travels furthest up the paper is the one that is
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Answer: C. most soluble in the solvent and least held by the paper
Explanation and discussion
Question 689· Separation of mixtures and purification· JAMB
The purest sample of common salt is obtained from sea water by
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Answer: B. crystallisation
Explanation and discussion
Question 690· 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 691· Separation of mixtures and purification· WAEC
The best method of obtaining crystals of copper(II) tetraoxosulphate(VI) from its solution is
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Answer: C. crystallisation
Explanation and discussion
Question 692· Separation of mixtures and purification· WAEC
Ogogoro is obtained by distilling fermented palm wine. The separation depends on a difference in the components'
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Answer: C. boiling points
Explanation and discussion
Question 693· 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 694· 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 695· 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 696· Separation of mixtures and purification· WAEC
The method used to separate sand from water is
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Answer: A. filtration
Explanation and discussion
Question 697· 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 698· 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 699· Separation of mixtures and purification· WAEC
Which method is best for separating the coloured components of ink?
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Answer: A. Chromatography
Explanation and discussion
Question 700· Separation of mixtures and purification· WAEC
A separating funnel is used to separate
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Answer: A. two immiscible liquids such as oil and water
Explanation and discussion

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JAMB and WAEC Chemistry questions

Which of the following does NOT increase the rate of a reaction?

Increasing the temperature increases the rate of a reaction mainly because

Food preservatives work mainly by

Ethanol (boiling point 78 °C) can be separated from water by

The liquid that passes through the filter paper during filtration is the

A mixture of ammonium chloride and sodium chloride is separated by

A mixture of chalk and water is separated by

In paper chromatography of a black ink, the component that travels furthest up the paper is the one that is

The purest sample of common salt is obtained from sea water by

A pure solid can be identified by its

The best method of obtaining crystals of copper(II) tetraoxosulphate(VI) from its solution is

Ogogoro is obtained by distilling fermented palm wine. The separation depends on a difference in the components'

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

The method used to separate sand from water is

Steam distillation is used to separate substances that are

A pure liquid can be identified by its

Which method is best for separating the coloured components of ink?

A separating funnel is used to separate