WAEC Chemistry questions: Environmental pollution

15 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Environmental pollution· WAEC

   Gas flaring at oil fields in the Niger Delta adds mainly which greenhouse gas to the atmosphere?

   • Aoxygen
   • Bcarbon(IV) oxide
   • Cnitrogen
   • Dargon

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   Explanation and discussion

2. Question 2· Environmental pollution· WAEC

   Carbon monoxide is poisonous because it

   • Ais acidic
   • Bcombines with haemoglobin and stops it carrying oxygen
   • Chas a strong smell
   • Ddissolves in the blood as an acid

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3. Question 3· Environmental pollution· WAEC

   Domestic generators should not be run indoors because they release

   • Aoxygen
   • Bcarbon monoxide, which can kill silently
   • Cnitrogen only
   • Dwater vapour only

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   Explanation and discussion

4. Question 4· Environmental pollution· WAEC

   Gas flaring in the Niger Delta releases

   • Aclean water
   • Bpure oxygen
   • Ccarbon dioxide and pollutants into the atmosphere
   • Dfertiliser

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   Explanation and discussion

5. Question 5· Environmental pollution· WAEC

   The main cause of water pollution in many Nigerian rivers is

   • Aphotosynthesis
   • Brainfall
   • Cevaporation
   • Ddumping of untreated sewage and refuse

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   Explanation and discussion

6. Question 6· Environmental pollution· WAEC

   Chlorofluorocarbons (CFCs) damage which layer of the upper atmosphere?

   • Awater vapour
   • Bozone
   • Ccarbon(IV) oxide
   • Dargon

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7. Question 7· Environmental pollution· WAEC

   Carbon(II) oxide is poisonous because it

   • Adestroys lung tissue
   • Bdissolves in blood to form an acid
   • Ccombines with haemoglobin and stops it carrying oxygen
   • Dblocks the nose

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8. Question 8· Environmental pollution· WAEC

   Which gas is mainly responsible for the greenhouse effect?

   • Acarbon(IV) oxide
   • Bnitrogen
   • Coxygen
   • Dargon

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9. Question 9· Environmental pollution· WAEC

   Acid rain damages buildings made of limestone because the acid

   • Areacts with calcium trioxocarbonate(IV)
   • Bfreezes in the stone
   • Cdissolves the cement only
   • Dadds water to the stone

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10. Question 10· Environmental pollution· WAEC

    Which of the following gases contributes to acid rain?

    • AArgon
    • BNitrogen
    • COxygen
    • DSulphur dioxide

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11. Question 11· Environmental pollution· WAEC

    Acid rain is caused mainly by

    • Aozone
    • Bcarbon monoxide
    • Cmethane
    • Dsulphur dioxide and oxides of nitrogen

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    Explanation and discussion

12. Question 12· Environmental pollution· WAEC

    Chlorofluorocarbons (CFCs) damage the environment by

    • Acausing hard water
    • Bdepleting the ozone layer
    • Cforming rust
    • Dfertilising soil

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    Explanation and discussion

13. Question 13· Environmental pollution· WAEC

    Noise pollution can best be reduced by

    • Ausing silencers on generators and vehicles
    • Bburning refuse
    • Cplanting crops near roads
    • Dusing more loudspeakers

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14. Question 14· Environmental pollution· WAEC

    Non-biodegradable wastes such as plastics are best managed by

    • Aburning in the open
    • Brecycling
    • Cdumping in rivers
    • Dburying in farmland

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15. Question 15· Environmental pollution· WAEC

    Acid rain is mainly caused by

    • Alead compounds
    • Bcarbon(II) oxide only
    • Coxides of sulphur and nitrogen
    • Dhydrogen gas

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    Explanation and discussion