Correct increasing order for the wavelength of absorption in the visible regin for the complexes +3 is

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co (en)_{3}]}^{3 +}$

${[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co (en)_{3}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

${[Co (en)_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}, {[Co {(H_{2} O)}_{6}]}^{3 +}$

${[Co {(H_{2} O)}_{6}]}^{3 +}, {[Co (en)_{3}]}^{3 +}, {[Co {({NH}_{3})}_{6}]}^{3 +}$

answer is B.

(Unlock A.I Detailed Solution for FREE)

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

The increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is [Co(en)₃]³⁺<[Co(NH₃)₆]³⁺<[Co(H₂O)₆]3+.

The decreasing order of ligands strength is en > NH₃ >H₂O. Stronger ligand causes greater splitting between two energy levels.

The energy of light absorbed is more and the wavelength of light absorbed is less for the stronger ligand.

Watch 3-min video & get full concept clarity

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test