Pure phosphine is not combustible while impure phosphine is combustible. This combustibility is due to the presence of :

P_{2} H_{4}

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N_{2}

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P H_{5}

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P_{2} O_{5}

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Solution

The correct option is A $P_{2} H_{4}$
Phosphine is a non-combustible gas but burns in air at 150C producing $P_{2} O_{5}$ .

Impure phosphine (containing $P_{2} H_{4}$ ) catches fire when comes in contact with air.

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