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Wednesday, 01 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:
A mixture of iodine and sulphur crystals can be separated by treatment with
  • A Water to filter off sulphur
  • B Carbon (IV) sulphide to filter off iodine
  • C Ethanoic acid to filter off sulphur
  • D Methanol to filter off iodine
View Answer & Explanation
Question 2:
A mixture of iodine and sulphur crystals can be separated by treatment with
  • A Water to filter off sulphur
  • B Carbon (IV) sulphide to filter off iodine
  • C Ethanoic acid to filter off sulphur
  • D Methanol to filter off iodine
View Answer & Explanation
Question 3:
Sieving is a technique used to separate mixture containing solid particles of
  • A Small sizes
  • B Large sizes
  • C Differents sizes
  • D The same sizes
View Answer & Explanation
Question 4:
Which of the following compounds is composed of Al, Si, O and H?
  • A Epsom salt
  • B Limestone
  • C Clay
  • D Urea
View Answer & Explanation
Question 5:
50 cm3 of carbon (II) oxide was exploded with 150 cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
  • A Carbon (II) oxide
  • B Carbon (IV) oxide
  • C Oxygen
  • D Nitrogen
View Answer & Explanation