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A student places a clean zinc strip in a blue copper sulphate solution. After some time, a reddish-brown coating forms on the strip and the blue colour of the solution fades. Which is the correct explanation of this observation?

Answer and explanation

Correct answer: Zinc is more reactive than copper, so it displaces copper from copper sulphate.

Zinc is more reactive than copper. Therefore, zinc displaces copper from copper sulphate solution:

\(\mathrm{Zn + CuSO_4 \rightarrow ZnSO_4 + Cu}\)

The reddish-brown coating is deposited copper, and the blue colour fades because blue \(\mathrm{Cu^{2+}}\) ions are removed from the solution. Unlike option B, copper cannot displace zinc because copper is less reactive than zinc.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateZincRedox Reaction

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