JEE Main · 2004 · 24 Apr 2004 · Offline · Coordination Compounds

Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by

CN^{-}

ion towards metal species is

(A)a, b
(B)a, b, c
(C)c, a✓ Correct
(D)b, c

Answer: (C)

Solution

Towards metal species the cyanide ion shows two kinds of behaviour. It is an excellent ligand, binding metals into stable complexes such as

[Fe (CN) X_{6}] X^{4 -}

and

[Ag (CN) X_{2}] X^{-}

, so it is complexing. It can also serve as a reducing agent in suitable reactions. It does not act as an oxidiser towards metals, so the pair of properties it shows is complexing and reducing.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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