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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 861:

Greenhouse effect can be reduced by controlling

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A Water evaporation
B Burning wood and fossil fuel
C The use of aerosols
D The use of artificial fertilizers

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Question 862:

Waste plastics accumulate in the soil and pollute the environment because plastic materials are

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A Insoluble in water
B Non -biodegradable
C Easily affected by heat
D Inflammab,le

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Question 863:

Which of the following substance is an ore of iron?

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A Bauxite
B Cassiterite
C Haematite
D Steel

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Question 864:

The ammonium compound used in the manufacture of dry cells is

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A NH₄NO₃
B (NH₄)SO₄
C NHCI₄
D (NH₄)₂CO₃

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Question 865:

Which of the following equations represents a substitution reaction?

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A C ₂H_10(g) + CI _2(g) â†’ C₄H₉ CI_(g) + HCI_(g)
B C ₂H_4(g) + HCI _(g) → C ₂H₅ CI_(l)
C C₂H_2(g) + 2H _2(g) â†’ C ₂H_6(g)
D C ₃H_4(g) + 40_2(g) â†’ 3CO_2(g) + 2H ₂O_(g)

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