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Question

Which of the following is not true about phosphine?

A
Phosphine is a colourless gas
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B
Phosphine has a rotten fish smell
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C
Phosphine is inflammable in pure form
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D
Phosphine is highly poisonous
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Solution

The correct option is C Phosphine is inflammable in pure form
Phosphine is a colourless gas with rotten fish smell and is highly poisonous. In pure state, phosphine is non-flammable but becomes flammable owing to the presence of P2H4 or P4 vapours.

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