CH-1747

Oxidising and reducing agents

Chemistry · Secondary 4 · Medium · Oxidising and reducing agents

A strip of zinc metal is placed into a blue solution of copper(II) sulfate. The blue colour fades and a brown solid forms on the zinc. Which ionic equation best represents this reaction?

$Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu$
$Zn^{2+} + Cu \rightarrow Zn + Cu^{2+}$
$Zn + CuSO_4 \rightarrow ZnSO_4 + Cu^{2+}$
$Zn^{2+} + Cu^{2+} \rightarrow Zn + Cu$

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