JEE Advanced Chemistry question

Which of the following complexes are chelates

(A)-(dimethylglyoximato)nickel(II)Correct
(B)Potassium ethylenediaminetetracyanatochromate(III)Correct
(C)Tetraamminedicyanocobalt(III) nitrate
(D)Trans-diglycinatopalladium(II)Correct

Answer: (A),(B),(D)

Solution

(a) involves two bidentate DMG ligands forming chelate rings with nickel — a chelate. The ethylenediaminetetracyanatochromate(III) complex (b) involves the hexadentate EDTA-type framework forming multiple chelate rings — a chelate. Trans-diglycinatopalladium(II) (d) involves two

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Question ID VK-160131