Which of the following complexes is not a chelate?

Bis(dimethylglyoximato) nickel (II)

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Potassium ethylendiamine tetrathiocyanato chromate (III)

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Tetrammine carbonatocobalt (III) nitrate

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Trans-diglycinatoplatinum (II)

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Solution

The correct option is D Tetrammine carbonatocobalt (III) nitrate
The complex Tetrammine carbonatocobalt (III) nitrate is the only option in which the the ligands (ammine and cabonato) are monodentate and hence it does not form a chelate on the other hand rest all complexes have polydentate ligands.

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