pBlock ElementsII - Result Question 86
####82. A soluble compound of a poisonous element $M$, when heated with $Zn / H _2 SO _4$, 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 $N$.
$(1997,2 M)$
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Solution:
- The poisonous element $M$ may be As. On the basis of given information
$$ \begin{array}{r} AsCl _3+6 H \xrightarrow{Zn / HCl} \underset{N}{AsH _3+3 HCl} \ 2 AsH _3 \xrightarrow{\Delta} \underset{M}{2 As}+3 H _2 \end{array} $$
