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Phosphine

Phosphine [...

Question

Phosphine $[P H_{3}]$ decomposes to produce $P_{4} (g)$ and $H_{2} (g)$ . What would be the change in volume when $100 m l$ of $P H_{3} (g)$ is completely decomposed ?

50 m l

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500 m l

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75 m l

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250 m l

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Solution

The correct option is D $50 m l$
$4 P H_{3} (g) ⟶ P_{4} (g) + 6 H_{2} (g)$
$4 m l$ $P H_{3} ⟶ 6 m l$ of $H_{2}$
$100 m l$ $P H_{3} ⟶ \frac{6}{4} \times 100 = 150 m l$
Change in volume= $(150 - 100) m l = 50 m l$

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