The best
known pseudohalide is CN-.This resembles Cl- , Br- and I- in the following
respects:
(i) It forms an acid, HCN.
(ii) It can be oxidised to (CN)2 molecule.
(iii) It forms insoluble salts with Ag+, Pb2+ and Hg22+
(iv) It forms large number of complexes
similar to halide complexes,
e.g. [Cu (CN)4]2-
and [CuCl4]2, [Co(CN)6]3- and [CoCl6]3-
(v) Inter-pseudohalogen compounds
ClCN, BrCN and ICN can be formed.
(vi) AgCN is insoluble in water but
soluble in ammonia like AgCl.
Related Questions:
Number of lone pair present at central atom of I3- ion and also give hybridisation and shape of ion?
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