JAMB and WAEC Chemistry questions

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

1. Question 381· Environmental pollution· JAMB

   Eutrophication of lakes is caused mainly by

   • Aoil spills
   • Bfertilisers rich in nitrates and phosphates washed into the water
   • Cdust
   • Dsand

   Show answer

   Answer: B. fertilisers rich in nitrates and phosphates washed into the water

   Explanation and discussion

2. Question 382· Environmental pollution· WAEC

   Which of the following gases contributes to acid rain?

   • AArgon
   • BNitrogen
   • COxygen
   • DSulphur dioxide

   Show answer

   Answer: D. Sulphur dioxide

   Explanation and discussion

3. Question 383· Environmental pollution· WAEC

   Acid rain is caused mainly by

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

   Show answer

   Answer: D. sulphur dioxide and oxides of nitrogen

   Explanation and discussion

4. Question 384· Environmental pollution· JAMB

   Biodegradable waste is waste that

   • Acan be broken down by microorganisms
   • Bis made of plastic
   • Cis made of glass
   • Dis a metal can

   Show answer

   Answer: A. can be broken down by microorganisms

   Explanation and discussion

5. Question 385· Environmental pollution· WAEC

   Chlorofluorocarbons (CFCs) damage the environment by

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

   Show answer

   Answer: B. depleting the ozone layer

   Explanation and discussion

6. Question 386· Environmental pollution· JAMB

   Acid rain damages buildings made of

   • Aplastic
   • Bglass
   • Climestone and marble
   • Dgold

   Show answer

   Answer: C. limestone and marble

   Explanation and discussion

7. Question 387· Environmental pollution· JAMB

   A common source of lead pollution is

   • Atable salt
   • Bleaded petrol and old batteries
   • Ccotton fabric
   • Drainwater

   Show answer

   Answer: B. leaded petrol and old batteries

   Explanation and discussion

8. Question 388· Environmental pollution· JAMB

   The greenhouse effect is mainly caused by an increase in atmospheric

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

   Show answer

   Answer: B. carbon(IV) oxide

   Explanation and discussion

9. Question 389· Environmental pollution· JAMB

   Oil spillage in rivers kills fish mainly because the oil

   • Aprevents oxygen from dissolving in the water
   • Bmakes the water too warm
   • Cadds nutrients
   • Dincreases light

   Show answer

   Answer: A. prevents oxygen from dissolving in the water

   Explanation and discussion

10. Question 390· 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

    Show answer

    Answer: A. using silencers on generators and vehicles

    Explanation and discussion

11. Question 391· Environmental pollution· JAMB

    The loudness of noise pollution is measured in

    • Anewtons
    • Bhertz
    • Cdecibels
    • Djoules

    Show answer

    Answer: C. decibels

    Explanation and discussion

12. Question 392· Environmental pollution· JAMB

    Eutrophication of rivers and lakes is mainly caused by

    • Aheavy rainfall
    • Bcarbon(IV) oxide in the air
    • Crun-off of fertilisers containing nitrates and phosphates
    • Dsunlight

    Show answer

    Answer: C. run-off of fertilisers containing nitrates and phosphates

    Explanation and discussion

13. Question 393· Environmental pollution· WAEC

    Non-biodegradable wastes such as plastics are best managed by

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

    Show answer

    Answer: B. recycling

    Explanation and discussion

14. Question 394· Environmental pollution· JAMB

    Lead compounds were formerly added to petrol to

    • Aprevent knocking in engines
    • Bcolour the petrol
    • Creduce smoke
    • Dmake it cheaper

    Show answer

    Answer: A. prevent knocking in engines

    Explanation and discussion

15. Question 395· Environmental pollution· WAEC

    Acid rain is mainly caused by

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

    Show answer

    Answer: C. oxides of sulphur and nitrogen

    Explanation and discussion

16. Question 396· Kinetic theory of matter and gas laws· WAEC

    The change of a gas directly to a solid is called

    • Adeposition
    • Bsublimation
    • Cevaporation
    • Dmelting

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    Answer: A. deposition

    Explanation and discussion

17. Question 397· Kinetic theory of matter and gas laws· JAMB

    Real gases deviate most from ideal behaviour at

    • Alow pressure and high temperature
    • Bhigh pressure and low temperature
    • Croom temperature and pressure
    • Dall conditions equally

    Show answer

    Answer: B. high pressure and low temperature

    Explanation and discussion

18. Question 398· Kinetic theory of matter and gas laws· WAEC

    A gas occupies 120 cm³ at 1 atm. What volume does it occupy at 3 atm at constant temperature?

    • A360 cm³
    • B40 cm³
    • C120 cm³
    • D20 cm³

    Show answer

    Answer: B. 40 cm³

    Explanation and discussion

19. Question 399· Kinetic theory of matter and gas laws· JAMB

    

    On the heating curve, the temperature stays constant between D and E because the heat supplied is used to

    • Araise the temperature of the liquid
    • Bchange the liquid into gas
    • Cmelt the solid
    • Dcool the gas

    Show answer

    Answer: B. change the liquid into gas

    Explanation and discussion

20. Question 400· Kinetic theory of matter and gas laws· WAEC

    A gas at 2 atm and 300 K is heated at constant volume to 450 K. Its new pressure is

    • A1.33 atm
    • B3 atm
    • C4.5 atm
    • D2 atm

    Show answer

    Answer: B. 3 atm

    Explanation and discussion