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Chemistry JAMB Past Questions

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1151
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
View Answer & Discuss (8) JAMB 1988
1152

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)?

  • 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 & Discuss (12) JAMB 1988
1153
Which of the followingstatements is TRUE?
  • A. The dissolution of NaOH(s) in water is endothermic
  • B. The heat os solution of NaOH(s) is positive
  • C. The NaOH(s) gains heat from the surroundings
  • D. The heat of solution of NaOH(s) is negative
View Answer & Discuss (4) JAMB 1988
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1154
Which property of a reversible reaction is affected by a catalyst?
  • A. Heat content (enthalphy)
  • B. Energy of activation
  • C. Free energy change
  • D. Equilibrium position
View Answer & Discuss (9) JAMB 1988
1155
Which of the following is used in fire extinguishers?
  • A. Carbon (ll) oxide
  • B. Carbon (lV) oxide
  • C. Sulphur (lV) oxide
  • D. Ammonia
View Answer & Discuss (2) JAMB 1988
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