In the electrothermal process, the compound displaced by silica from calcium phosphate is:

calcium phosphide

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phosphine

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phosphorus

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phosphorus pentoxide

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Solution

The correct option is B phosphorus pentoxide
In the electrothermal process, the mixture of coke, silica, and calcium phosphate is heated in an electric furnace. In this process, the compound displaced by silica from calcium phosphate is phosphorus pentoxide. The reaction can be given as follow:

$2 C a_{3} (P O_{4})_{2} + 6 S i O_{2} \to 6 C a S i O_{3} (S l a g) + P_{4} O_{10}$

$P_{4} O_{10} + 10 C \to P_{4} (w h i t e p h o s p h o r u s) + 10 C O$

Here calcium silicate is removed as slag.
Thus, option D is correct

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