HCN + H 2 O [X]+NH 3 , [X] [Y] + H 2 O (Unbalanced equati…

Chemistry D and F - Block Elements NTA Abhiyas Question Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

HCN + H 2 O [X]+NH 3 ,

[X] [Y] + H 2 O (Unbalanced equations)

[Y] May be prepared by which one of the following methods?

By dehydration of Malonic acid with P 2 O 5

By thermal decomposition of carbon sub-oxide in air.

By heating potassium hexacyanoferrate (II) with cone. H 2 SO 4 .

By the action of cone. HNO 3 on charcoal.

Text Solution

Verified by Experts

The correct answer is:

HCN + 2H 2 O HCOOH (X) + 2NH 3 ;

HCOOH CO[Y]+H 2 O

(iii) Only K 4 Fe(CN) 6 gives CO with conc. H 2 SO 4 according to the following reaction.

K 4 [Fe(CN) 6 ]+6H 2 SO 4 (conc.) + 6H 2 O 2K 2 SO 4 + FeSO 4 + 3(NH 4 ) 2 SO 4 + 6CO

(i) Malonic acid gives CsO 2 ;

(ii) C 3 O 2 gives CO 2 .

(iv) Action of cone. HNO 3 on charcoal gives CO 2 .

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