Question 536:

• JAMB 1988

Which of the following substances is a basic salt?

A. Na₂CO₃
B. Mg(OH)CI
C. NaHCO₃
D. K_{[/sub]SO[sub]4}.AI₂(SO₄)₃,24H₂O

Question 537:

• JAMB 1988

Which of the following acts both s a reducing and an oxidizing agent?

A. H₂
B. SO₂
C. H₂S
D. C

Question 538:

• JAMB 1988

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

A. Cu²⁺ + 2e^- → Cu(s)
B. 2Cl^- -2e → Cl₂
C. Cu_(s) -2e → Cu²⁺_(aq)
D. Cu²⁺_(aq) + 2Cl^-_(aq) → CuCl_2(aq)

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?

A. Iodide is oxidized
B. Tetraoxosulphate (Vl) acid acts as an oxidizing agent
C. Starch has been oxidized
D. K₂Cr₂O₇ is oxidized

Question 540:

• JAMB 1988

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na₂S₂O_3(aq) + 2HCl_(aq) → 2NaCI_(aq) + H₂O_(I) + SO_2(g) + S_(g)?

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