Compound $B$ on strong heating gives:

C u O, N O_{2}, O_{2}

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H g, N O_{2}, O_{2}

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A g, N O_{2}, O_{2}

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P b, N O_{2}, O_{2}

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Solution

The correct option is A $C u O, N O_{2}, O_{2}$
Answer :
(C) $A g, N O_{2}, O_{2}$
Solution : - (1) $A (m e t a l) + H N O_{3} \to B (s a l t + C oxide of Nitrogen$
(2) $B (a q) + N a C l \to D (p p t) N H_{4} O H - ---- \to S o l u b l e$ .
(3) $B (a q) + N a_{2} S_{2} O_{3} (a q) \to E (w h i t e p p t) stand for long time - ---------- \to b l a c k$
Ans: $∴$ following reaction information given below
(I) $A g (A) + 2 H N O_{3} \to A g N O_{3} (B) + H_{2} O + 2 N O (C)$
(II) $A g N O_{3} (B) + N a C l \to A g C l ↓ N H_{4} O H A g (N H_{3}) (S o l u b l e) + N a N O_{3}$
(III) $A g N O_{3} + N a_{2} S_{2} O_{3} \to A g_{2} S_{2} O_{3} H_{2} O - - \to A g_{2} S (b l a c k)$
$B : - 2 A g N O_{3} \to S t r o n g H e a t 2 A g (s) + O_{2 (g)} + 2 N O_{2 (g)}$ .

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