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Question
A solution contains magnesium ions (Mg+2), iron (II) ions (Fe+2) and copper ions (Cu+2). On passing an electric current through this solution, which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.
Solution
Cu+2 will be discharged first.
\[\ce{Cu^{+2} + 2e- -> Cu}\]
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