Q28 / 120 · NTA Abhyas (JEE Main) 2020 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following metal nitrate produces gaseous product when reacts with KCN solution?

Correct answer
A
$C u (N O_{3})_{2}$
B
$A g N O_{3}$
C
$C d (N O_{3})_{2}$
D
$P b (N O_{3})_{2}$

Solution

{(A)2Cu(NO}_{3})_{2} + 4KCN \to {KNO}_{3} + \underset{(Redox)}{2CuCN} {+(CN)}_{2} ↑

(B)

A g N O_{3} + K C N \to K N O_{3} + A g C N ↓

(ppt. formation)

(C)

C d (N O_{3})_{2} + 2 K C N \to 2 K N O_{3} + P b (C N)_{2} ↓

(ppt formation)

(D)

P b (N O_{3})_{2} + 2 K C N \to 2 K N O_{3} + P b (C N)_{2} ↓

(ppt formation)

Hence, the correct answer is option: 'A'.

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