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Chemistry 1997 JAMB Past Questions

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21
What is the oxidation number of Z in K3ZCl6?
  • A. -3
  • B. +3
  • C. -6
  • D. +6
View Answer & Discuss (3) JAMB 1997
22
2H2S(g) + SO2(g) + H2O(I) → 3S(s) + 3H2O(I)..........(i) 3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) + N2(g).........(II) In the equations above, the oxidizing agent (I) and the reducing agent in (II) respectively are?
  • A. H2S and NH3
  • B. SO2 and CuO
  • C. SO2 and NH3
  • D. H2S and CuO
View Answer & Discuss (8) JAMB 1997
23

2SO2(g) + O2(g) → 2SO3. In the reaction above, the standard heats of formation of SO2(g) and SO3(g) are -297 KJ mol-1 and -396 kJ/mol respectively. The heat change of the reaction is?

  • A. -99 kJ mol-
  • B. -198 kJ mol-
  • C. +198 kJ mol-
  • D. +683kJ mol-
View Answer & Discuss (12) JAMB 1997
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24
If the rate law obtained for a given reaction is rate = k(X)n (Y)m, what is the overall order of the reaction?
  • A. nm
  • B. n/m
  • C. n + m
  • D. n - m
View Answer & Discuss (6) JAMB 1997
25
One method of driving the position of equilibrium of an endothermic reaction forward is to?
  • A. increase temperature at constant pressure
  • B. dcrease pressure at constant temperature
  • C. cool down the apparatus with water
  • D. decreases temperature at constant pressure
View Answer & Discuss (3) JAMB 1997
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