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How can ultrapure silicon be prepar e d ...

How can ultrapure silicon be prepar e d from impure silicon?

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At first, impure Si is treated with chlorine gas to produce impure `SiCl_4`, which on distillation forms pure `SiCl_4`. Pure `SiCl_4` thus produced is reduced by `H_2` gas to ultrapure silicon.
`underset("impure")(Si)overset(Cl_2)tounderset("impure")(SiCl_4)overset("Distilied")to underset("pure")(SiCl_4)underset(-4HCl)overset(H_2//Delta)tounderset("ultra pure")(Si)`
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