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Chemistry 2007 WAEC Past Questions

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21
A solution of a salt X reacts with AgNO3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
  • A. CI-
  • B. Pb 2+
  • C. SO 2-
  • D. Zn2+
View Answer & Discuss (1) WAEC 2007
22
Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆H = - 92kJmol1. Finely divided iron is used as catalyst in the reaction in order to
  • A. lower the value of ∆H
  • B. increase the time for attainment of equilibrium
  • C. shorten the time for attainment of equilibrium
  • D. decrease the yield of ammonia
View Answer & Discuss (5) WAEC 2007
23
Which of these cell notations is the correct representation of a Daniell cell?
  • A. Zn(s) / Zn2+(aq) // Cu2+(aq)/Cu(s)
  • B. Cu(s) / CU2+(aq) // Zn2+(aq) / Zn(s)
  • C. Zn2+(aq) / Zn(s) // Cu2+(aq) /Cu(s)
  • D. Cu2+(aq) / Cu(s) // Zn(s) / Zn2+(aq)
View Answer & Discuss (3) WAEC 2007
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24
What is the oxidation number of chromium in K2CrO4?
  • A. +1
  • B. +2
  • C. +4
  • D. +6
View Answer & Discuss (2) WAEC 2007
25
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
  • A. Chlorine
  • B. Hydrogen
  • C. Oxygen
  • D. Sodium
View Answer & Discuss (7) WAEC 2007
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