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

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It is prepared in the laboratory by disproportionation of phosphorous acid:
4 H₃PO₃→ PH₃+ 3 H₃PO_4.
Phosphine evolution occurs around 200 °C. Alternative methods involve the hydrolysis of aluminium phosphide, calcium phosphide, and tris(trimethylsilyl)phosphine

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