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
$AsCl _3+6 H \xrightarrow{Zn / HCl} \underset{N}{AsH _3} +3 HCl $
$2 AsH _3 \xrightarrow{\Delta} \underset{M}{2 As}+3 H _2$
BETA
