Question

Draw labelled diagram of Laboratory method of phosphine and give chemical equation?

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Solution

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It is prepared in the laboratory by disproportionation of phosphorous acid:

4 H3PO3 → PH3 + 3 H3PO4.

Phosphine evolution occurs around 200 °C. Alternative methods involve the hydrolysis of aluminium phosphide, calcium phosphide, and tris(trimethylsilyl)phosphine

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