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Chemistry Past Questions

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111

\(\frac{1}{2}\)Zn\(^{2+}\)(aq) + e\(^-\) → \(\frac{1}{2}\) Zn(s)
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol\(^{-1}\)]

  • A. 0.965 x 104C
  • B. 4.820 x 104C
  • C. 9.650 x 104C
  • D. 48.200 x 104C
View Answer & Discuss (19) JAMB 2000
112

Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday's law can be written as

  • A. M = Z/Q
  • B. M = Q/Z
  • C. M = Z/2Q
  • D. M = QZ
View Answer & Discuss (15) JAMB 2000
113

0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.
[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg-1K-1]

  • A. +3000 KJ mol-1
  • B. +300 KJ mol-1
  • C. -300 KJ mol-1
  • D. -3000 KJ mol-1
View Answer & Discuss (25) JAMB 2000
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114

Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has

  • A. more molecules
  • B. more atoms
  • C. larger surface area
  • D. relatively large mass
View Answer & Discuss (4) JAMB 2000
115

N2(g) + O2(g) ↔ 2NO(g); ΔH = + 180.6 kJ mol-1
In the reaction above, increase in temperature will

  • A. increase the quantity of N2
  • B. increase in the yield of NO
  • C. decrease the yield of NO
  • D. decrease the quantity of O2
View Answer & Discuss (9) JAMB 2000
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