NEET | 2017Chemical BondingHard

Question

 Correct increasing order for the wavelengths of absorption in the visible region the complexes of Co3+ is :-

Options

A.

[Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+

B.

Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+

C.

[Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+

D.

[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+

Solution

εa∞1λa
where εa ⇒ absorbed energy (splitting energy)
        λa ⇒ absorbed wavelength
Presence of SFL ⇒ εa(↑)λa(↓)
H2O < NH3 < en ligand strength ↑splitting energy ↑ so absorbed λ↓

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