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Explain the preparation of silicon tetrachloride.

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1. 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.

SiO2 + 2C + 2Cl2 → SiCl2 + 2CO 

2. On commercial scale, reaction of silicon with hydrogen chloride gas occurs above 600 K.

Si + 4HCl → SiCl4 + 2H2

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