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in which of the following pair of complexes choose the one that absorbs light at a longer wavelength
a)[co(NH3)6]2+ ,[CO(H20)6]2+
Dear Aman,
Energy of splitting (Δ) = hc/λ
so if Δ↓ then λ↑
Δ has less value in case of weak lingand as compared to strong ligand.
here in compound (a) NH3 is a strong ligand so there will be higher value of Δ and thus lower value of λ.
therefore option (b) which contains weak ligand H2O will absorb light at a longer wavelength
With Regards,
Abhishek Jain
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