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Synthesis by Reduction of Nitriles

An unknown in...

Question

An unknown inorganic compound $(X)$ gave the following reactions.
(i) the compound $(X)$ on heating gave a residue, oxygen and oxide of nitrogen.
(ii) an aqueous solution of compound to tap water gave a turbidity which did not dissolve in $H N O_{3}$
(iii) the turbidity dissolved in $N H_{4} O H$ .
Identify the compound $(X)$ :

A

X = A g N O_{3}

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B

X = A g N O_{2}

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C

X = A g N_{2} O_{5}

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D

None of these

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Solution

The correct option is D $X = A g N O_{3}$
Option (A) is correct.
$(X)$ is $A g N O_{3}$
As the compound contains nitrate ions so on heating the compound with $c o n c . H_{2} S O_{4}$ ,following reaction takes place :
$A g N O_{3} + H_{2} S O_{4} ⟶ N a H S O_{4} + H N O_{3}$
$4 H N O_{3} ⟶ 4 N O_{2} + O_{2} + 2 H_{2} O$
As the compound contains silver cations, following reactions takes place :
$A g N O_{3} + N H_{4} O H ⟶ A g (N H_{3})_{2} N O_{3} + 2 H_{2} O$
$A g (N H_{3})_{2} N O_{3}$ + $H N O_{3} ⟶$ $A g N O_{3} (w h i t e p p t, r e g e n e r a t e d) + N H_{4} N O_{3}$

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