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Wednesday, 01 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 16:
JAMB 2001
Environmental pollution is worsened by the release from automobile exhausts of
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  • A Water vapour
  • B Steam
  • C Smoke
  • D Heavy metals
View Answer & Explanation
Question 17:
JAMB 2001
The chemical used for coagulation in water purification is
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  • A Aluminium tetraoxosulphate (VI)
  • B Copper tetraoxosulphate (VI)
  • C Sodium tetraoxosulphate (VI)
  • D Calcium tetraoxosulphate (VI)
View Answer & Explanation
Question 18:
JAMB 2001
Phosphorus is stored under water to prevent it from
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  • A Dehydrating
  • B Becoming inert
  • C Smelling
  • D Catching fire
View Answer & Explanation
Question 19:
JAMB 2001
In which of the following reactions does reduction takes place
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  • A Fe2+ - e- → Fe3+
  • B 2O2- →O2 + 4e-
  • C Cr – 2e- → Cr2+
  • D 2H+ + 2e- → H2
View Answer & Explanation
Question 20:
JAMB 2001
P(g) + Q(g) ↔ 3R(s) + S(g) ΔH is negative
Which of the following will increase the yield of R?
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  • A Using a larger close vessel
  • B Increasing the temperature
  • C Removing some S
  • D Adding a positive catalyst
View Answer & Explanation

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