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Chemistry JAMB Past Questions

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971

The pH of a solution obtained by mixing 100cm\(^3\) of a 0.1M HCl solution with 100cm\(^3\) of a 0.2M solution of NaOH is?

  • A. 1.3
  • B. 7.0
  • C. 9.7
  • D. 12.7
View Answer & Discuss (30) JAMB 1998
972
Mg2+(aq) + 2e->(aq) → Mg(s)(volts) = 2.370

Zn2+(aq) + 2e->(aq) → Zn(s)(volts) = -0.763

Cds2+(aq) + 2e->(aq) → Cd(s)(volts) = 0.403

Cu2+(aq) + 2e->(aq) → Cu(s)(volts) = 0.340

In the electrochemical series above, the strongest reducing agents is?
  • A. Cu (s)
  • B. Cd(s)
  • C. Znsub>(s)
  • D. Mg(s)
View Answer & Discuss (13) JAMB 1998
973
2Cl2(g) + 2H2O(g) 4HCl(g) + O2(g)
∆H° = +115KJ mol-1. In the above equilibrium reaction, a decrease in temperature will?
  • A. favour the reverse reaction
  • B. favour the forward reaction
  • C. have no effect on the equilibrium state
  • D. double the rate of the reverse raection
View Answer & Discuss (2) JAMB 1998
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974

2X(g) + Y(g) → Z(g): In the equation above, The rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is?

  • A. R = k (X)(Y)
  • B. R = K (X) ° (Y)
  • C. R = K (X) ° (Y) 2
  • D. R = K (X) 2(Y)°
View Answer & Discuss (7) JAMB 1998
975
A gas that turns a filter paper previously soaked in lead ethanoate solution black is?
  • A. hyrogen chloride
  • B. hydrogen sulphide
  • C. sulphur (IV) oxide
  • D. sulphur (VI) oxide
View Answer & Discuss JAMB 1998
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