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Explain the preparation of silicon tetra...

Explain the preparation of silicon tetrachloride.

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(i) silicon tetrachloride can be prepared by passing dry chlorine over an intimate mixture of silica and carbon by heating to 1675 K in a porcelain tube.
`SiO_(2)+2C+2Cl_(2)toSiCl_(4)+2CO`
(ii) On commercial scale, reaction of silicon with hydrogen chloride gas occurs above `600 K`.
`Si+4HCl to SiCl_(4)+2H_(2)`
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