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How is phosphine prepard in the laborato...

How is phosphine prepard in the laboratory?

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White phosphorous
Phosphire is prepared by heating white phosphorous with conc. `NaOH` in inert atmosphere of `CO_(2)`.
`P_(4)+3NaOH+3H_(2)Orarr PH_(3)+3NaH_(2)PO_(2)`
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