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Phosphine is generally prepared in the laboratory

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By heating phosphorus in a current of hydrogen

By heating white phosphorus with aqueous solution of caustic potash

By heating red phosphorus with an aqueous solution of caustic soda

By decomposition of $P_{2} H_{4}$ at 110°C

answer is B.

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Detailed Solution

$\underset{White}{P_{4}} + 3 NaOH + 3 H_{2} O \to \underset{Phosphine}{{PH}_{3}} + 3 {NaH}_{2} {PO}_{2}$

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