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Chemistry 2011 WAEC Past Questions

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31

On evaporation to dryness, 250 cm3 of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?

  • A. 1.0 mol dm-3
  • B. 2.0 mol dm-3
  • C. 4.0 moldm-3
  • D. 5.0 moldm-3
View Answer & Discuss (3) WAEC 2011
32

Consider the following reaction equation:

X(g) + Y(g) ⇌ XY(g); ∆H = + 220KJ mol-1 If the temperature of the system is increased, the

  • A. backward reaction would be favoured
  • B. forward reaction would favoured
  • C. reaction would stop
  • D. reaction would be at equilibrium
View Answer & Discuss (2) WAEC 2011
33
What is the value of n in the following equation? Cr2O72- + 14H+ + ne- → 2Cr 3+ + 7H2O
  • A. 2
  • B. 3
  • C. 6
  • D. 7
View Answer & Discuss (7) WAEC 2011
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34
What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO4 for 1 hour? [Cu = 63.5; 1F = 96500C]
  • A. 5.9 g
  • B. 11.8 g
  • C. 23.8 g
  • D. 47.3 g
View Answer & Discuss (6) WAEC 2011
35
Which of the following metals could be used as sacrifical anode for preventing the corrosion of iron?
  • A. Copper
  • B. Lead
  • C. Magnesium
  • D. Silver
View Answer & Discuss (7) WAEC 2011
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