$S n O_{2}$ is reduced to metallic Sn on smelting oxide with anthracite and lime. In this, the function of lime is :

it acts as a flux

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it removes acidic impurities as slag

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it removes ,basic impurities as slag

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it acts as a slag

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Solution

The correct options are
A it acts as a flux
C it removes acidic impurities as slag
In the smelting process the black Sn is mixed with anthracite and little limestone which acts as flux, now this mixture is heated to a degree centigrade of 1200-1300, as a result, $S n O_{2}$ is reduced to Sn. This crude is having many acid impurities which can be removed as slag. $S n O_{2} + 2 C \Rightarrow S n + 2 C$ .

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SnO2 is reduced to metallic Sn on smelting oxide with anthracite and lime. In this, the function of lime is :

$S n O_{2}$ is reduced to metallic Sn on smelting oxide with anthracite and lime. In this, the function of lime is :