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Which one of th efollowing does not form a chelate with oxalate ion by reacting in aqueous solution ?
A. cis-`[Co(NH_(3))_(4)Br_(2)]^(+1)`
B. cis-`[Co(NH_(3))_(4)Cl_(2)]^(+1)`
C. cis-`[Co(en)_(2)Cl_(2)]^(+1)`
D. trans-`[Co(en)_(2)Cl_(2)]^(+1)`

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Correct Answer - d
C is -complexes can form chelate . But trans cannot from chelate ring as it cannot be stable .

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