When copper pyrites is roasted in excess of air, a mixture of $C u O + F e O$ is formed is present as impurities. This can be removed as slag during reduction of $C u O$ . The flux added to form slag is

S i O_{2}

which is an acid flux

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Lime stone, which is a basic flux

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S i O_{2}

, which is a basic flux

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C a O

, which is a basic flux

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Solution

The correct option is A $S i O_{2}$ which is an acid flux
Ferrous oxide combines with silica and forms ferrous silicate. By this reaction most of the iron is removed as slag.
$F e O + S i O_{2} ⟶ F e S i O_{3}$

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When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurity. This can be removed as slag during reduction of CuO. The flux added to form slag is

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

STATEMENT-1 :

S i O_{2}

is used as an acidic flux in metallurgy.
STATEMENT-2 :

S i O_{2}

removes basic impurities forming a slag.

Q. During the formation of the slag by the reaction of flux and impurities which of the following is an example of acidic and basic flux?
(i)

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

(ii)

S i O_{2} + M g O \to M g O \to M g S i O_{3}

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When copper pyrites is roasted in excess of air, a mixture of CuO+FeO is formed is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is

The correct option is A SiO2 which is an acid fluxFerrous oxide combines with silica and forms ferrous silicate. By this reaction most of the iron is removed as slag.FeO+SiO2⟶FeSiO3

When copper pyrites is roasted in excess of air, a mixture of $C u O + F e O$ is formed is present as impurities. This can be removed as slag during reduction of $C u O$ . The flux added to form slag is

The correct option is A $S i O_{2}$ which is an acid flux
Ferrous oxide combines with silica and forms ferrous silicate. By this reaction most of the iron is removed as slag.
$F e O + S i O_{2} ⟶ F e S i O_{3}$