Coordination CompoundHardBloom L3
Question
An ion M2+, forms the complexes [M(H2O)6]2+, [M(en)3]2+ and [MBr6]4–, match the complex with the appropriate colour.
Options
A.Green, blue and red
B.Blue, red and green
C.Green, red and blue
D.Red, blue and green
Solution
Sol. 
⇓ ↑E = $\frac{hc}{\lambda \downarrow}$
⇒ $\overset{\quad VIB\overset{*}{G}Y\overset{*}{O}\overset{*}{R}(\lambda \uparrow )\quad}{\rightarrow}$ (absorbed spectrum)
⇒ among green, orange, Red
⇒ green has less λ, and more energy
⇒ since, among all ligands en is strongest, absorbed color of compound containing en is green
⇒ observed color of [M(en)3]+3 is complementing color of green which is Red.
Strength of ligand:- en > H2O > Br
λen < $\lambda_{H_{2}O}$< λBr
⇒ Blue → [M (H2O)6]±n
Green → [M (Br)6]±n
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