When copper pyrite is roasted in excess of air, a mixture of $C u_{2} S$ and $F e O$ are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is

Silica which is an acidic flux

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Limestone, which is a basic flux

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$S i O_{2}$ which is a basic flux

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CaO which is a basic flux

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Solution

The correct option is A
Silica which is an acidic flux

FeO (Basic gangue) impurity is mixed with $S i O_{2}$ (acidic flux) to form a fusible slag

$F e O$ $+ S i O_{2}$ $\to$ $F e S i O_{3}$

(slag)

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When copper pyrite is roasted in excess of air, a mixture of Cu2S and FeO are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is

The correct option is A Silica which is an acidic flux FeO (Basic gangue) impurity is mixed with SiO2 (acidic flux) to form a fusible slag FeO +SiO2 → FeSiO3 (slag)

When copper pyrite is roasted in excess of air, a mixture of $C u_{2} S$ and $F e O$ are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is

The correct option is A
Silica which is an acidic flux

FeO (Basic gangue) impurity is mixed with $S i O_{2}$ (acidic flux) to form a fusible slag

$F e O$ $+ S i O_{2}$ $\to$ $F e S i O_{3}$

(slag)