Correct increasing order for the wavelengths of absorption in the visible region the complexes of $Co^{3+}$ is :
- $[Co(H_2O)_6]^{3+},\, [Co(en)_3]^{3+},\, [Co(NH_3)_6]^{3+}$
- $[Co(H_2O)_6]^{3+},\, [Co(NH_3)_6]^{3+},\, [Co(en)_3]^{3+}$
- $[Co(NH_3)_6]^{3+},\, [Co(en)_3]^{3+} ,\, [Co(H_2O)_6]^{3+}$
- $[Co(en)_3]^{3+} ,\, [Co(NH_3)_6]^{3+},\, [Co(H_2O)_6]^{3+}$
The Correct Option is D
Solution and Explanation
The order of the ligand in the spectrochemical series
\(H _{2} O < NH _{3}< en\)
Hence, the wavelength of the light observed will be in the order
[Co(en)3]3+,[Co(NH3)6]3+,[Co(H2O)6]3+
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.