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Chemistry WAEC Past Questions

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741

Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?

  • A. AI(NO3)3
  • B. KNO3
  • C. N2O
  • D. NH3
View Answer & Discuss (5) WAEC 2008
742
Consider the reaction represented by the question below: KOH(aq) + HCI(aq) → KCI(aq) + H2O(l) What volume of 0.25 mol dm-3 KOH would be required to completely neutralize 40 cm3 of 0.10 mol dm -3 HCI?
  • A. 40 cm3
  • B. 32cm3
  • C. 24cm3
  • D. 16cm3
View Answer & Discuss (7) WAEC 2008
743
When 100 cm3 of a saturated solution of KCIO3 at 40oC is evaporated, 14 g of the salt is recovered what is the solubility of KCIO3 at 40oC? [KCIO3 = 122.5]
  • A. 11.42 mol dm-3
  • B. 8.80 mol dm-3
  • C. 1. 14 mol dm-3
  • D. 0.88 mol dm-3
View Answer & Discuss (3) WAEC 2008
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744
The high solubility of ethanol in water is due to its
  • A. low boiling point
  • B. low freezing point
  • C. covalent nature
  • D. hydrogen bonding
View Answer & Discuss WAEC 2008
745
Consider the equilibrium reaction represented by the equation: 2SO2(g) + O2(g) ⇌ 2SO3(g) ∆H = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings about
  • A. decrease in rate of the reaction of the system
  • B. decrease in temperature of the system
  • C. increase in temperature of SO3
  • D. increase in concentration of SO2
View Answer & Discuss (7) WAEC 2008
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