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Chemistry 2013 WAEC Past Questions

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31
A substance is said to be impure if
  • A. its melting point range is wide
  • B. it dissolves in water with difficult
  • C. it has a low melting point
  • D. it is coloured
View Answer & Discuss (3) WAEC 2013
32
The following factors affect the solubility of a solid in a given solvent except
  • A. nature of solute
  • B. nature of solvent
  • C. pressure
  • D. temperature
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33

Consider the reaction represented by the equation: N\(_2\)O\(_4\)(g) ⇌ 2NO\(_2\)(g) ; ∆H = + x kJmol-1
What happens when the temperature is reduced at equilibrium?

  • A. Concentration of N 2O4(g) decreases
  • B. Concentration of N 2O4(g) increases.
  • C. Pressure exerted by the gases increases
  • D. Pressure exerted by the gases remains constant
View Answer & Discuss (5) WAEC 2013
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34

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

  • A. l and ll only
  • B. l, ll, and III only
  • C. lll and IV only
  • D. I and III only
View Answer & Discuss (2) WAEC 2013
35
Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
  • A. S4O62-(aq)
  • B. S4O32-(aq)
  • C. 12(aq)
  • D. 1-(aq)
View Answer & Discuss (8) WAEC 2013
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