Essential Chemistry for IGCSE - Metals And Reactivity (Section 4 - No. 26)
What happens to the copper(II) ions when magnesium is added to a copper(II) sulfate solution?
They gain electrons and are reduced.
They lose electrons and are oxidized.
They form a precipitate with the magnesium.
They do not react.
Explanation
In a displacement reaction, the more reactive metal (Mg) donates electrons to the copper ions, which are reduced.
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