Question

Among the properties (a) reducing (b) oxidizing and (c) complexing, the set of properties shown by $C{N}^{-}$ ion towards metal species is:

• A. $a,b,c$
• B. $b,c$
• C. $c,a$
• D. $a,b$

Answer 1

Answer: (C)

$c,a$

$C{N}^{-}$ is a better complexing agent as well as a reducing agent. Thus properties (a) and (c) are shown:

Property (c) $N{i}^{2+}$+ 4$C{N}^{-}\to \left[Ni\right(CN{)}_4{]}^{2-}$

Property (a) $CuC{l}_2$ + 5$KCN\to K_3\left[Cu\right(CN{)}_4]$ + 1/2 $(CN{)}_2$ + $2KCl$ ($C{N}^{-}$ reduces $C{u}^{2+}$to $C{u}^{+}$ ).