Given below the equation for the reactions taking place inside the blast furnace.
`C + O_2 rarr CO_2`
`CO_2 + C rarr 2CO`
`CaCO_3 rarr CaO + CO_2`
`CaO + SiO_2 rarr CaSiO_2`
`Fe_2 O_3 + 3CO rarr 2Fe + 3CO_2`
a) Name the ore of iron?
b) Which is the gangue in iron ore.
c) Name the flux used in blast fumace?
d) `Gangue + flux rarr ......`

Explanation

a) Calcination-`ZnCO_3`.roasting-`Cu_2S`
b) Carbon monoxide, carbon and electricity
c) Electricity