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 501· Non-metals and their compounds· WAEC
Which allotrope of carbon conducts electricity?
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Answer: D. graphite
Explanation and discussion
Question 502· Non-metals and their compounds· WAEC
Diamond and graphite are
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Answer: A. allotropes of carbon
Explanation and discussion
Question 503· Non-metals and their compounds· JAMB
Moist chlorine bleaches damp litmus paper because it
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Answer: D. forms chloric(I) acid (HOCl), which releases oxygen
Explanation and discussion
Question 504· Non-metals and their compounds· WAEC
The brown ring test is used to identify
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Answer: A. nitrate ions
Explanation and discussion
Question 505· Non-metals and their compounds· JAMB
Ammonia gas can be identified because it
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Answer: C. turns damp red litmus paper blue
Explanation and discussion
Question 506· Non-metals and their compounds· JAMB
Ozone is an allotrope of
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Answer: B. oxygen
Explanation and discussion
Question 507· Non-metals and their compounds· JAMB
Hydrogen sulphide smells of
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Answer: B. rotten eggs
Explanation and discussion
Question 508· Non-metals and their compounds· JAMB
A solution gives a white precipitate with silver trioxonitrate(V) solution. It contains
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Answer: B. chloride ions
Explanation and discussion
Question 509· Non-metals and their compounds· JAMB
Carbon(IV) oxide is prepared in the laboratory by the action of dilute hydrochloric acid on
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Answer: A. marble chips
Explanation and discussion
Question 510· Non-metals and their compounds· WAEC
The gas that burns with a blue flame and is very poisonous is
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Answer: C. carbon(II) oxide
Explanation and discussion
Question 511· Non-metals and their compounds· WAEC
Ammonia is collected by upward delivery because it is
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Answer: B. lighter than air
Explanation and discussion
Question 512· Non-metals and their compounds· JAMB
A solution gives a white precipitate with barium chloride that does not dissolve in dilute hydrochloric acid. The solution contains
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Answer: D. sulphate ions
Explanation and discussion
Question 513· Non-metals and their compounds· WAEC
A gas given off by a fermenting palm-wine jar turns lime water milky. The gas is
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Answer: B. carbon(IV) oxide
Explanation and discussion
Question 514· Non-metals and their compounds· WAEC
Ammonia gas is collected by
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Answer: B. upward delivery (downward displacement of air)
Explanation and discussion
Question 515· Non-metals and their compounds· JAMB
Ammonia gas and hydrogen chloride gas react to form white fumes of
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Answer: B. ammonium chloride
Explanation and discussion
Question 516· Non-metals and their compounds· JAMB
Nitrogen(IV) oxide gas is
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Answer: C. brown
Explanation and discussion
Question 517· Non-metals and their compounds· JAMB
Sulphur(IV) oxide bleaches coloured substances mainly by
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Answer: D. reduction
Explanation and discussion
Question 518· Non-metals and their compounds· JAMB
A gas that burns with a 'pop' when a lighted splint is applied is
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Answer: A. hydrogen
Explanation and discussion
Question 519· Non-metals and their compounds· WAEC
Chlorine bleaches damp litmus paper because it forms
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Answer: A. hypochlorous acid (HOCl), an oxidising agent
Explanation and discussion
Question 520· Non-metals and their compounds· WAEC
Moist chlorine bleaches litmus paper because it reacts with water to form
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Answer: C. oxochlorate(I) acid (HOCl)
Explanation and discussion

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JAMB and WAEC Chemistry questions

Which allotrope of carbon conducts electricity?

Diamond and graphite are

Moist chlorine bleaches damp litmus paper because it

The brown ring test is used to identify

Ammonia gas can be identified because it

Ozone is an allotrope of

Hydrogen sulphide smells of

A solution gives a white precipitate with silver trioxonitrate(V) solution. It contains

Carbon(IV) oxide is prepared in the laboratory by the action of dilute hydrochloric acid on

The gas that burns with a blue flame and is very poisonous is

Ammonia is collected by upward delivery because it is

A solution gives a white precipitate with barium chloride that does not dissolve in dilute hydrochloric acid. The solution contains

A gas given off by a fermenting palm-wine jar turns lime water milky. The gas is

Ammonia gas is collected by

Ammonia gas and hydrogen chloride gas react to form white fumes of

Nitrogen(IV) oxide gas is

Sulphur(IV) oxide bleaches coloured substances mainly by

A gas that burns with a 'pop' when a lighted splint is applied is

Chlorine bleaches damp litmus paper because it forms

Moist chlorine bleaches litmus paper because it reacts with water to form