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Chemistry 2001 WAEC Past Questions

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16

What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1

  • A. lonization energy
  • B. Electron affinity
  • C. Dissociation energy
  • D. Heat of atomization
View Answer & Discuss WAEC 2001
17

Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = - 65.7 kJmol-1. From the equation, it can be deduced that

  • A. direct combination is involved and the reaction is endothermic
  • B. a solid is formed and heat is evolved
  • C. activation energy is high and a catalyst is required
  • D. the reaction is endothermic and occurs at high temperature
View Answer & Discuss WAEC 2001
18

A reaction is represented by the equation below. A2(g) + B2(g)  → 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?

  • A. The reaction goes to completion at equilibrium
  • B. The forward reaction is exothermic
  • C. At equilibrium increase in temperature favours the reverse reaction
  • D. Pressure has no effect on the equilibrium mixture
View Answer & Discuss (1) WAEC 2001
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19

What is the oxidation number of nitrogen in Al(NO\(_3\))\(_3\)?

  • A. + 1
  • B. + 3
  • C. + 5
  • D. + 6
View Answer & Discuss (9) WAEC 2001
20

What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

  • A. Oxygen
  • B. Hydrogen
  • C. Nitrogen
  • D. Copper
View Answer & Discuss (3) WAEC 2001
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