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

Options

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

Explanation