In the metallurgical extraction of copper, following reaction is used : FeO+SiO_2→FeSiO_3 FeO and FeSiO_3 respectively are.

Q7 / 90 · JEE Main 2022 (28 Jun Shift 2) · Chemistry

In the metallurgical extraction of copper, following reaction is used :
$FeO + {SiO}_{2} \to {FeSiO}_{3}$
$FeO$ and ${FeSiO}_{3}$ respectively are.

During extraction of copper, iron oxide present as impurity is removed by adding ${SiO}_{2}$ and converting it into ${FeSiO}_{3}$

$FeO + {SiO}_{2} \to {FeSiO}_{3} Flux Slag$

Hence, $FeO$ is gangue and ${FeSiO}_{3}$ is slag.

Hence, the correct answer is option: 'D'.