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Extraction of Iron

Which of the ...

Question

Which of the following element is used in the extraction of Silicon when mixed with finely powdered silica:

A

Aluminum

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B

Copper

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C

Iron

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D

Magnesium

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Solution

The correct option is D
Magnesium

Finely powdered silica (sand and quartz) is mixed with magnesium powder and heated in a fire-clay crucible to obtain Silicon.
$S i O_{2} + 2 M g H e a t - -- \to S i + 2 M g O$

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