Q. 25.0( 3 Votes )

The colour of the A. [Co(CN)6]3–> [Co(NH3)6]3+>[Co(H2O)6]3+

B. [Co(NH3)6]3+> [Co(H2O)6]3+> [Co(CN)6]3–

C. [Co(H2O)6]3+> [Co(NH3)6]3+> [Co(CN)6]3–

D. [Co(CN)6]3–> [Co(NH3)6]3+> [Co(H2O)6]3+

Answer :

According to the spectrochemical series the increasing order of field strength is H2O<NH3<CN-. So, greater the field strength, greater is the crystal field splitting and the energy difference between t2g and eg orbitals will be higher. If the energy is higher, then the wavelength will be smaller.


E=


Energy(E) and wavelength(λ) are inversely related. So, the order in which the ligands absorb wavelength will be the reverse of the spectrochemical series.


H2O>NH3>CN-


So, from the above explanation we can conclude that Option C is the correct answer.

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