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Chemistry JAMB Past Questions

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931
When platinum electrodes are used during the electrolysis of copper (ll) tetraoxosulphate (lV) solution, the solution gets progressively?
  • A. acidic
  • B. basic
  • C. neutral
  • D. amphoteric
View Answer & Discuss (5) JAMB 1997
932
How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution?

(Ni = 58.7, 1F = 96 500 C mol-)
  • A. 0.20
  • B. 0.30
  • C. 0.40
  • D. 0.50
View Answer & Discuss (10) JAMB 1997
933
What is the oxidation number of Z in K3ZCl6?
  • A. -3
  • B. +3
  • C. -6
  • D. +6
View Answer & Discuss (3) JAMB 1997
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934
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
935

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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