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Question
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is:
Options
[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
[Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
[Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
[Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
MCQ
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Solution
[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
Explanation:
Stronger ligands cause greater crystal field splitting (Δ0), leading to absorption of higher energy (shorter wavelength) light.
Ligand strength: en > NH3 > H2O
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