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 521· Non-metals and their compounds· JAMB
Nitrogen is used in food packets because it
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Answer: D. is unreactive and prevents oxidation
Explanation and discussion
Question 522· Non-metals and their compounds· JAMB
Large quantities of nitrogen are used in the manufacture of
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Answer: A. ammonia
Explanation and discussion
Question 523· Non-metals and their compounds· WAEC
Concentrated tetraoxosulphate(VI) acid turns sugar into a black mass because it acts as a
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Answer: C. dehydrating agent
Explanation and discussion
Question 524· Non-metals and their compounds· WAEC
Allotropes of carbon include
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Answer: C. diamond and graphite
Explanation and discussion
Question 525· Non-metals and their compounds· JAMB
White phosphorus is stored under water because it
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Answer: C. catches fire spontaneously in air
Explanation and discussion
Question 526· Non-metals and their compounds· WAEC
The gas that turns lime water milky is
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Answer: A. carbon dioxide
Explanation and discussion
Question 527· Non-metals and their compounds· JAMB
Oxygen is prepared in the laboratory by heating potassium trioxochlorate(V) with manganese(IV) oxide. The manganese(IV) oxide acts as
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Answer: C. a catalyst
Explanation and discussion
Question 528· Non-metals and their compounds· WAEC
Carbon dioxide turns lime water milky due to the formation of
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Answer: A. calcium carbonate
Explanation and discussion
Question 529· Non-metals and their compounds· JAMB
When concentrated tetraoxosulphate(VI) acid is added to sugar, the sugar turns black because the acid acts as a
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Answer: B. dehydrating agent
Explanation and discussion
Question 530· Non-metals and their compounds· WAEC
Chlorine is used in the treatment of water because it
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Answer: B. kills germs
Explanation and discussion
Question 531· Non-metals and their compounds· JAMB
The Ostwald process manufactures
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Answer: C. trioxonitrate(V) acid
Explanation and discussion
Question 532· Non-metals and their compounds· WAEC
Concentrated sulphuric acid chars sugar because it acts as a
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Answer: A. dehydrating agent
Explanation and discussion
Question 533· Organic compounds· WAEC
Ethanol is produced industrially from sugar by
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Answer: C. fermentation
Explanation and discussion
Question 534· Organic compounds· JAMB
The octane rating of petrol is improved by increasing the proportion of
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Answer: A. branched-chain alkanes
Explanation and discussion
Question 535· Organic compounds· WAEC
The general name for long-chain molecules made by joining many small units is
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Answer: A. polymers
Explanation and discussion
Question 536· Organic compounds· JAMB
The functional group of carboxylic acids is
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Answer: D. –COOH
Explanation and discussion
Question 537· Organic compounds· JAMB
How many structural isomers has C₄H₁₀?
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Answer: C. 2
Explanation and discussion
Question 538· Organic compounds· WAEC
What is the general formula of the alkenes?
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Answer: A. CₙH₂ₙ
Explanation and discussion
Question 539· Organic compounds· JAMB
The reaction of methane with chlorine requires
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Answer: A. ultraviolet light or sunlight
Explanation and discussion
Question 540· Organic compounds· JAMB
Which of the following compounds will decolourise bromine water?
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Answer: C. C₃H₆
Explanation and discussion

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JAMB and WAEC Chemistry questions

Nitrogen is used in food packets because it

Large quantities of nitrogen are used in the manufacture of

Concentrated tetraoxosulphate(VI) acid turns sugar into a black mass because it acts as a

Allotropes of carbon include

White phosphorus is stored under water because it

The gas that turns lime water milky is

Oxygen is prepared in the laboratory by heating potassium trioxochlorate(V) with manganese(IV) oxide. The manganese(IV) oxide acts as

Carbon dioxide turns lime water milky due to the formation of

When concentrated tetraoxosulphate(VI) acid is added to sugar, the sugar turns black because the acid acts as a

Chlorine is used in the treatment of water because it

The Ostwald process manufactures

Concentrated sulphuric acid chars sugar because it acts as a

Ethanol is produced industrially from sugar by

The octane rating of petrol is improved by increasing the proportion of

The general name for long-chain molecules made by joining many small units is

The functional group of carboxylic acids is

How many structural isomers has C₄H₁₀?

What is the general formula of the alkenes?

The reaction of methane with chlorine requires

Which of the following compounds will decolourise bromine water?