1.

The wavelength of light absorbed is highest in(a) [Co(NH3)5Cl]2+(b) [Co(NH3)5H2O]3+(c) [Co(NH3)6]3+(d) [Co(en)3]3+

Answer»

The correct option is(a) [Co(NH3)5Cl]2+.

Explanation:

As in complex [Co(NH3)5Cl]2+Cl- is present as ligand which is weakest among ligands present in other complexes, so it requires less energy for excitation. Thus, the wavelength of light absorbed will be highest (i.e., El/λ).



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