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Wednesday, 01 April 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 536:
JAMB 1988
Which of the following substances is a basic salt?
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  • A Na2CO3
  • B Mg(OH)CI
  • C NaHCO3
  • D K[/sub]SO[sub]4.AI2(SO4)3,24H2O
View Answer & Explanation
Question 537:
JAMB 1988
Which of the following acts both s a reducing and an oxidizing agent?
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  • A H2
  • B SO2
  • C H2S
  • D C
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Question 538:
JAMB 1988
Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?
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  • A Cu2+ + 2e- → Cu(s)
  • B 2Cl- -2e → Cl2
  • C Cu(s) -2e → Cu2+(aq)
  • D Cu2+(aq) + 2Cl-(aq) → CuCl2(aq)
View Answer & Explanation
Question 539:
JAMB 1988
A mixture of starch solution and potassium iodide was placed in a test tube. On adding dilute tetraoxosulphate (lV) acid and then K2Cr2O7 solutions, a blue-black colour was produced. In this reaction, the?
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  • A Iodide is oxidized
  • B Tetraoxosulphate (Vl) acid acts as an oxidizing agent
  • C Starch has been oxidized
  • D K2Cr2O7 is oxidized
View Answer & Explanation
Question 540:
JAMB 1988
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)?
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  • A A decrease in temperature and an increase in the concentration of the reactants
  • B An increase in the temperature and a decrease in the cocentration of the reactants
  • C An increase in temperature and an increase in the concentration of the reactants
  • D A decrease in the temperature and a decrease in the concentration of the reactants
View Answer & Explanation

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