WAEC - Chemistry (2000 - No. 27)
An iron nail placed in a solution copper (ll) tetraoxosulphate (VI) is soon covered with a deposit of copper. Which of the following equations represents the reactions ?
Fe 2+ (aq) + Cu(s) → Fe 3+ + Cu 2+ (aq)
Fe 2+ (aq) + Cu(s) → Fe(s) + Cu2+ (aq)
Fe (s) + Cu2+ (aq) → Fe2+(aq) + Cu2+ (aq)
Fe(s) + Cu2+ → Fe2+(aq) + Cu(s)
Explanation
When an iron nail is placed in a solution of copper (ll) tetraoxosulphate (VI), the nail is covered with a brown deposit of copper, which means it's solid, and green FeSO4 (Fe2+) is also produced. Perusing the equations in the given options, it's only in option D we have Cu solid as one of it's product. Option D is the correct answer.
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