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Chemistry 1992 JAMB Past Questions

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21
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.
  • A. 2.7
  • B. 5.4
  • C. 10.8
  • D. 21.7
View Answer & Discuss (13) JAMB 1992
22
S2O2-3 + I2 → S2O62- + 2I-. In reaction above, the oxidizing agent is?
  • A. S2O32-
  • B. I2
  • C. S4O62-
  • D. I-
View Answer & Discuss (5) JAMB 1992
23

\(MnO_2 + 2CI^- + 4H^+ → Mn^{2+} + CI_2 + 2H_2O\).
The changes in oxidation numbers when the manganese, chloride, and hydrogen ions react according to the above equation are respectively?

  • A. 2, 2, 4
  • B. -1, -2, 4
  • C. -2, 1, 0
  • D. 2, 4, 0
View Answer & Discuss (12) JAMB 1992
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24

In which of the following is the entropy change positive?

  • A. H2O(I) → H2O(g)
  • B. Cu2+(aq) + Fe(s) → Fe2+(aq) + Cu(s)
  • C. N2(g) + 3H2(g) → 2NH3(g)
  • D. 2HCI(g) → H2(g) + CI2(g)
View Answer & Discuss (22) JAMB 1992
25

In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?

  • A. The additional of the two is expected to be one
  • B. The product of the two is expected to be one
  • C. The two equilibrium constants are identical
  • D. The product of the two is always greater than one
View Answer & Discuss (15) JAMB 1992
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