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

1. [Co(H2O)6]^3+, [Co(en)3]^3+, [Co(NH3)6]^3+
2. [Co(H2O)6]^3+, [Co(NH3)6]^3+, [Co(en)3]^3+
3. [Co(NH3)6]^3+, [Co(en)3]^3+, [Co(H2O)6]^3+
4. [Co(en)3]^3+, [Co(NH3)6]^3+, [Co(H2O)6]^3+

Correct answer: [Co(H2O)6]^3+, [Co(NH3)6]^3+, [Co(en)3]^3+

Solution

The ligand field strength increases in the order H2O < NH3 < en. A stronger ligand field causes a larger splitting of d-orbitals, leading to absorption of shorter wavelengths. Thus, the correct order is [Co(H2O)6]^3+ < [Co(NH3)6]^3+ < [Co(en)3]^3+.

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