Arrange the following according to the instructions given in brackets :
$M g^{2 +}, C u^{2 +}, N a^{1 +}, H^{1 +}$ (In the order of preferential discharge at the cathode)

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Solution

$N a^{1 +} < M g^{2 +} < H^{1 +} < C u^{2 +}$
(According to electrochemical series of metals)

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