The equations represent redox reactions.
In which equation is the underlined substance acting as a reducing agent?
1 )
$\underline {CaO} + {H_2}O \to Ca{\left( {OH} \right)_2}$
2 )
$\underline {C{O_2}} + C \to 2CO$
3 )
$\underline {CuO} + {H_2} \to Cu + {H_2}O$
$3\underline {CO} + F{e_2}{O_3} \to 2Fe + 3C{O_2}$
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