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

It acts as a flux

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It removes basic impurities as slag

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Both as in (a) and (b)

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None of the above

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Solution

The correct option is C Both as in (a) and (b)
Sand acts as a flux. It removes the gangue to form easily fusible slag.
Sand removes basic impuriites as slag.
$S i O_{2} A c i d i c f l u x + F e O B a s i c g a n g u e \to F e S i O_{3} S l a g$
Thus both (a) and (b) represents the function of sand.

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