Finely powdered silica is mixed with ___ powder and heated in a fire-clay crucible.

magnesium

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carbon

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manganese

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phosphorous

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Solution

The correct option is A magnesium
Finely powdered silica(sand and quartz) is mixed with magnesium powder and the mixture is heated in a fire - clay crucible. The products formed are magnesium dioxide and silicon are formed. The product is treated with dilute hydrochloric acid to remove magnesium dioxide. Then it is treated with hydrofluoric acid to give pure silicon.

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