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Number of Statements which are true for `CN^(-)` ,pseudohalide ion,in its resemblance to `Cl^(-),Br^(-),I^(-)]`
i) It forms an acid `HCN`
ii) It can be oxidized to `(CN)_(2)` molecule.
iii) It forms insoluble salts with `Ag^(+),Pb^(2+)` and `Hg_(2)^(2+)`
iv) It forms large number of complexes similar to halide complexes e.g. `[Cu(CN)_(4)]^(2-)[Co(CN)_(6)]^(3-)`
v) `AgCN` is insoluble in water but soluble in ammonia like `AgCl`.
Vi) `HCN` can be oxidized similar to `HCl` .

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