Which of the following(s) is/are true about phosphine?

Phosphine is a colourless gas

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Phosphine has a rotten fish smell

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Phosphine is inflammable in pure form

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Phosphine is highly poisonous

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Solution

The correct option is D Phosphine is highly poisonous
Phosphine is a colourless gas with rotten fish smell and is highly poisonous. In pure state, phosphine is non-flammable but in impure state becomes flammable owing to the presence of impurities like $P_{2} H_{4}$ or $P_{4}$ vapours.

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