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Number of statement which are true for C...

Number of statement which are true for CN`overset(-)`, a pseudohalide ion:-
1. It forms an acid HCN .
2. It can be oxidized to (C`N)_(2)` molecule.
3. It forms insoluble salts with Ag`overset(+)` , Pb`overset(+)` , and `Hg_(2)``overset(+2)`.
4. It foms large number of complex similar to halide complexes e.g. [Cu`(CN)_(4)`]`overset(-2)` and [Co`(CN)_(6)`]`overset(-3)`

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