CH-1557

Reactivity series

Chemistry · Secondary 4 · Medium · Reactivity series

A strip of magnesium is placed into an aqueous solution of iron(II) sulfate, FeSO

_4

. A grey solid forms on the magnesium and the green solution slowly turns colourless.

Which ionic equation correctly represents the reaction between magnesium and iron(II) ions?

$Mg + Fe^{2+} \rightarrow Mg^{2+} + Fe$
$Mg^{2+} + Fe \rightarrow Mg + Fe^{2+}$
$Mg + Fe^{2+} + 2e^- \rightarrow Mg^{2+} + Fe$
$Mg^{2+} + Fe^{2+} \rightarrow Mg + Fe^{3+}$

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