1.

Out of the following pairs (of complexes), in which option, first complex is more stable than second complex :

Answer»

`[CO(NO_(2))_(6)]^(4-)" and "[Co(NO_(2))_(6)]^(3-)`
`[Co(H_(2)O)_(6)]^(2+)" and "[Co(NH_(3))_(6)]^(2+)`
`[Co(TRIEN)]^(2+)" and "[Co(en)_(2)]^(2+)`
`[Mn(NH_(3))_(6)]^(2+)" and "[Ni(NH_(3))_(6)]^(2+)`

Solution :`[Ci(trien)]^(2+)` has BETTER chelation.


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