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886
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
887

Consider the following electrochemical cell notation: M(s) / M2+ (aq)// H+ (aq)/ H2(g). The value of the electrode potential is positive when?

  • A. electrons flow from the metal electrode, M(s) to hydrogen electrode, H2(g)
  • B. electrons fow from hydrogen electrode, H2(g) to metal electrode, M(s)
  • C. the flow of current is high
  • D. there is equilibrium between the flow of electrons from the hydrogen electrode, H2(g) to metal electrode, M(s)
View Answer & Discuss (4) WAEC 2011
888
Which of the following compounds determines the octane rating of petrol?
  • A. 1,2,3 - trimethlpentane
  • B. 2,3,5 - trimethyloctane
  • C. 2,3,5 - trimethylpentane
  • D. 2,2,4 - trimethylpentane
View Answer & Discuss WAEC 2011
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889
Which of the following compounds would react with ethanoic acid to give a sweet smelling liquid?
  • A. Alkane
  • B. Alkanol
  • C. Alkanal
  • D. Alkyne
View Answer & Discuss (1) WAEC 2011
890
Which of the following separation techniques would show that black ink is a mixture of chemical compounds?
  • A. Crystallization
  • B. Chromatography
  • C. Filtration
  • D. Sublimation
View Answer & Discuss (1) WAEC 2011
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