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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
Question
Why is $\left[ Cu ( CN )_4\right]^{2-}$ complex ion is more stable than the $\left[ Cu \left( NH _3\right)_4\right]^{2+}$ complex ion?
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Answer

$CN ^{-}$is a stronger ligand than $NH _3$, hence, $\left[ Cu ( CN )_4\right]^{2-}$ is more stable than $\left[ Cu \left( NH _3\right)_4\right]^{2+}$.

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