MCQ
Phosphine $[PH_3(g)]$ decomposes to produce vapours of phosphorus $(P_4)$ and $H_2$ gas. What will be the change in volume when $100\ mL$ of phosphine is decomposed ? .......... $mL$
- A$+50$
- B$500$
- ✓$+75$
- D$-500$
✓
Answer
Correct option: C.
$+75$
c
$\begin{array}{*{20}{c}}
{P{H_3}\, \to }&{\frac{1}{4}{P_4}\,\,\, + }&{\frac{3}{2}{H_2}} \\
{100\,\,ml}&{\frac{{100}}{4}\,ml}&{\frac{3}{2}\, \times \,100\,ml} \\
&{25\,\,ml}&{150\,ml}
\end{array}$
$\begin{array}{*{20}{c}}
{P{H_3}\, \to }&{\frac{1}{4}{P_4}\,\,\, + }&{\frac{3}{2}{H_2}} \\
{100\,\,ml}&{\frac{{100}}{4}\,ml}&{\frac{3}{2}\, \times \,100\,ml} \\
&{25\,\,ml}&{150\,ml}
\end{array}$
change in vol. $=+75\, \mathrm{mL}$
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