Iron is extracted from hematite in the blast furnace at a temperature of about ${1550^ \circ }C$.
Which equation shows the main reaction that increases the temperature in the furnace?
1 )
$CaC{O_3} \to CaO + C{O_2}$
$C + {O_2} \to C{O_2}$
3 )
$C{O_2} + C \to 2CO$
4 )
$F{e_2}{O_3} + 3CO \to 2Fe + 3C{O_2}$
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