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Q.

Pure phosphine is non-flammable. But it becomes inflammable due to presence of

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a

$P_{2} H_{4} or P_{4} vapours$

b

$HCl$

c

$H_{2} {SO}_{4}$

d

$H_{3} {PO}_{3}$

answer is B.

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$P_{2} H_{4} or P_{4}$ vapours make ${PH}_{3}$ inflamable.

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