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Chemistry WAEC Past Questions

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976

A spot of oil paint on a shirt can best be removed using?

  • A. brine
  • B. detergent
  • C. kerosine
  • D. warm water
View Answer & Discuss (7) WAEC 2012
977

Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction?

  • A. Particle size of CuO(s)
  • B. Concentration of H2SO4(aq)
  • C. Temperature of the reacting mixture
  • D. Pressure of reaction system
View Answer & Discuss (2) WAEC 2012
978

Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator

  • A. l and lll only
  • B. ll and lll only
  • C. l and ll only
  • D. l, ll and lll
View Answer & Discuss (3) WAEC 2012
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979

The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is

  • A. +3
  • B. +2
  • C. -2
  • D. -3
View Answer & Discuss (2) WAEC 2012
980

Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is

  • A. cracking
  • B. fermentation
  • C. polymerization
  • D. reforming
View Answer & Discuss WAEC 2012
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