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A student places a zinc strip in a blue copper sulphate solution and claims that no chemical reaction has occurred. Which observation would prove the student's conclusion wrong?

Answer and explanation

Correct answer: The blue colour of the solution fades and a reddish-brown deposit of copper forms on the zinc strip

Zinc is more reactive than copper, so it displaces copper from copper sulphate solution: \(\mathrm{Zn + CuSO_4 \rightarrow ZnSO_4 + Cu}\). As blue \(\mathrm{Cu^{2+}}\) ions are removed, the solution fades and reddish-brown copper is deposited on the zinc strip. The hydrogen bubbles in option B are typically produced when a metal reacts with an acid, not with copper sulphate solution.

Related tags

Chemical ReactionsDisplacement ReactionReactivity SeriesCopper SulphateZincObservations

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