AIIMS 2007
- Exam
- AIIMS
- Year
- 2007
- Subject
- Chemistry
- Chapter
- d and f Block Elements
AIIMS 2007 · Chemistry · d and f Block Elements
Cyanogen gas is obtained in the reaction
Cyanogen gas is obtained in the reaction
Options
- A(\mathrm{CuSO}_{4(a q)}+\mathrm{KCN} \longrightarrow)
- B(\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right] \stackrel{\text{ heat }}{\longrightarrow})
- C(\mathrm{CH}_3 \mathrm{CN}+\mathrm{H}_2 \mathrm{O} \stackrel{\Delta}{\longrightarrow})
- D(\mathrm{CH}_3 \mathrm{CONH}_2+\mathrm{P}_2 \mathrm{O}_5 \stackrel{\Delta}{\longrightarrow})
Correct answer
A. (\mathrm{CuSO}_{4(a q)}+\mathrm{KCN} \longrightarrow)
Step-by-step solution
(2 \mathrm{CuSO}_4+4 \mathrm{KCN} \rightarrow(\mathrm{CN})_2+2 \mathrm{CuCN}+2 \mathrm{~K}_2 \mathrm{SO}_4)
On combining solution of copper (II) salts and cyanides, an unstable copper (III) cyanide is formed which rapidly decomposes into copper (I) cyanide and cyanogen.