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 461· Metals and their compounds· JAMB
Duralumin is used to build aircraft because it is
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Answer: C. light and strong
Explanation and discussion
Question 462· Metals and their compounds· JAMB
Alloys are generally
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Answer: B. harder than the pure metals in them
Explanation and discussion
Question 463· Metals and their compounds· WAEC
Duralumin is used in aircraft bodies because it is
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Answer: B. light and strong
Explanation and discussion
Question 464· Metals and their compounds· JAMB
The main ore of aluminium is
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Answer: A. bauxite
Explanation and discussion
Question 465· Metals and their compounds· JAMB
Which metal is a liquid at room temperature?
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Answer: C. mercury
Explanation and discussion
Question 466· Metals and their compounds· WAEC
Iron nails in a test tube with boiled water covered by oil do not rust because
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Answer: D. oxygen is excluded
Explanation and discussion
Question 467· Metals and their compounds· JAMB
When sodium hydroxide solution is added to a solution containing iron(III) ions, the precipitate formed is
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Answer: A. reddish-brown
Explanation and discussion
Question 468· Metals and their compounds· WAEC
Which metal reacts with cold water to give hydrogen?
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Answer: B. sodium
Explanation and discussion
Question 469· Metals and their compounds· WAEC
Aluminium is extracted by electrolysis rather than by reduction with carbon because
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Answer: C. it is more reactive than carbon
Explanation and discussion
Question 470· Metals and their compounds· JAMB
Sodium is stored under paraffin oil because it
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Answer: C. reacts readily with air and water
Explanation and discussion
Question 471· Metals and their compounds· WAEC
Galvanising protects iron by coating it with
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Answer: A. zinc
Explanation and discussion
Question 472· Metals and their compounds· JAMB
Cryolite is added in the extraction of aluminium to
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Answer: D. lower the melting point of alumina
Explanation and discussion
Question 473· Metals and their compounds· WAEC
A clean iron nail in boiled water covered with a layer of oil does not rust because
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Answer: A. no oxygen can reach it
Explanation and discussion
Question 474· Metals and their compounds· WAEC
Bronze, used for medals and statues, is an alloy of
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Answer: C. copper and tin
Explanation and discussion
Question 475· Metals and their compounds· JAMB
In the blast furnace, iron is extracted from its ore using
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Answer: B. coke and limestone
Explanation and discussion
Question 476· Metals and their compounds· JAMB
Aluminium is extracted from its ore by:
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Answer: A. electrolysis of alumina dissolved in molten cryolite
Explanation and discussion
Question 477· Metals and their compounds· WAEC
In the blast furnace, iron is obtained from haematite mainly by reduction with
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Answer: D. carbon(II) oxide
Explanation and discussion
Question 478· Metals and their compounds· JAMB
Transition metals commonly
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Answer: A. form coloured compounds and act as catalysts
Explanation and discussion
Question 479· Metals and their compounds· JAMB
Galena is an ore of
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Answer: C. lead
Explanation and discussion
Question 480· Metals and their compounds· JAMB
Brass is an alloy of
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Answer: D. copper and zinc
Explanation and discussion

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JAMB and WAEC Chemistry questions

Duralumin is used to build aircraft because it is

Alloys are generally

Duralumin is used in aircraft bodies because it is

The main ore of aluminium is

Which metal is a liquid at room temperature?

Iron nails in a test tube with boiled water covered by oil do not rust because

When sodium hydroxide solution is added to a solution containing iron(III) ions, the precipitate formed is

Which metal reacts with cold water to give hydrogen?

Aluminium is extracted by electrolysis rather than by reduction with carbon because

Sodium is stored under paraffin oil because it

Galvanising protects iron by coating it with

Cryolite is added in the extraction of aluminium to

A clean iron nail in boiled water covered with a layer of oil does not rust because

Bronze, used for medals and statues, is an alloy of

In the blast furnace, iron is extracted from its ore using

Aluminium is extracted from its ore by:

In the blast furnace, iron is obtained from haematite mainly by reduction with

Transition metals commonly

Galena is an ore of

Brass is an alloy of