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  4. 100 mL of PH3 on decomposition produced phosphorus and hydrogen. The change in volume is

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Q. $100 \,mL$ of $PH_3$ on decomposition produced phosphorus and hydrogen. The change in volume is

Some Basic Concepts of Chemistry

Solution:

$\underset{2 \text { vol }}{2 PH _3} \rightarrow \underset{3 \text { vol }}{3 H _2}+2 P$
2 vol of $PH _3$ give 3 vol of $H _2$
$\therefore 100\, m L$ of $PH _3$ gives $150 \,mL$ of $H _2$
$\therefore$ Increase in volume $=150 \,m L-100 \,m L$ $=50\, m L$