Silica is added to roasted copper ores during smelting in order to remove:

Cuprous sulphide

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Ferrous oxide

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Ferrous sulphide

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Cuprous oxide

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Solution

The correct option is B Ferrous oxide
Silica is added to roasted copper ores during smelting in order to remove $F e O$ (ferrous oxide) as $F e S i O_{3}$ (slag).
$F e O + S i O_{2} \to F e S i O_{3}$

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Silica is added to roasted copper ores during smelting in order to remove:

The correct option is B Ferrous oxideSilica is added to roasted copper ores during smelting in order to remove FeO (ferrous oxide) as FeSiO3 (slag).FeO+SiO2→FeSiO3

The correct option is B Ferrous oxide
Silica is added to roasted copper ores during smelting in order to remove $F e O$ (ferrous oxide) as $F e S i O_{3}$ (slag).
$F e O + S i O_{2} \to F e S i O_{3}$