In basic medium the amount of `Ni^(2+)` in a solution can be estimated with the dimethylglyoxime reagent. The correct statemnt(s) about the reaction an the product is (are)

Options

A. in ammoniacal solution `Ni^(2+)` salts given cherry red precipitate of nickel (II) dimethlglyoximate
B. two dimethylglyoximate units are bound to one `Ni^(2+)`
C. in the complex two dimethylglyoximate units are hydrogen bonded to each other
D. each dimethylglyoximate unit forms a six membered chelate ring with `Ni^(2+)`

Explanation