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CGP EDU Academic Team
Published on: August 13, 2026
Hexacyano complexes of metals in their +2 oxidation state are usually yellow while the corresponding hexaaqua compound are often blue or green, This is so because
A
Hexacyano complexes absorb orange or red light thus appear yellow while hexaaqua complexes absorb indigo thus appear yellow
B
Hexacyano complxes absorb indigo thus appearing yellow while hexaaqua complexes absorb orange or red light thus appear blue or green
C
Hexacyano complexes absorb yellow light while hexaaqua complexes absorb blue light
D
ions are yellow in colour while aque ions are blue or green in colour.
Text Solution
Verified by ExpertsThe correct answer is:
B
The ligand 
absorbs indigo, the high energy radiation and thus appears yellow. The aqua complexes have much smaller CFSE, they absorb orange or red light and thus appear green.
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