pBlock ElementsII 1 Question 86
82. A soluble compound of a poisonous element $M$, when heated with $\mathrm{Zn} / \mathrm{H}{2} \mathrm{SO}{4}$, gives a colourless and extremely poisonous gaseous compound $N$, which on passing through a heated tube gives a silvery mirror of element $M$. Identify $M$ and $N$.
$(1997,2 \mathrm{M})$
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Solution:
- The poisonous element $M$ may be As. On the basis of given information
$$ \begin{array}{r} \mathrm{AsCl}{3}+6 \mathrm{H} \xrightarrow{\mathrm{Zn} / \mathrm{HCl}} \underset{N}{\mathrm{AsH}{3}+3 \mathrm{HCl}} \ 2 \mathrm{AsH}{3} \xrightarrow{\Delta} \underset{M}{2 \mathrm{As}}+3 \mathrm{H}{2} \end{array} $$
