NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice
H C N + H 2 O → X + N H 3 , X → Y + H 2 O U n b a l a n c e d e q u a t i o n s [Y] May be prepared by which one of the following methods?
Options
- ABy dehydration of Malonic acid with P 2 O 5
- BBy thermal decomposition of carbon sub-oxide in air.
- CBy heating potassium hexacyanoferrate (II) with conc. H 2 S O 4 .
- DBy the action of conc. H N O 3 on charcoal.
Correct answer
C. By heating potassium hexacyanoferrate (II) with conc. H 2 S O 4 .
Step-by-step solution
H C N + 2 H 2 O → H C O O H X + 2 N H 3 ; H C O O H → Δ C O Y + H 2 O (iii) Only K 4 F e C N 6 gives C O with conc. H 2 S O 4 according to the following reaction. K 4 F e C N 6 + 6 H 2 S O 4 c o n c . + 6 H 2 O → 2 K 2 S O 4 + F e S O 4 + 3 N H 4 2 S O 4 + 6 C O (i) Malonic acid gives C 3 O 2 ; (ii) C 3 O 2 gives C O 2 . (iv) Action of conc. H N O 3 on charcoal gives C O 2 .