In which equation does the oxidation of the underlined compound occur?
1 )
$2CuO + C \to C{O_2} + \underline {Cu} $
$F{e_2}{O_3} + \underline {3CO} \to 2Fe + 3C{O_2}$
3 )
$2Mg + {O_2} \to \underline {2MgO} $
4 )
$\underline {Mn{O_2}} + 4HCl \to MnC{l_2} + 2{H_2}O + C{l_2}$
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