Hexacyano complexes of metals in their +2 oxidation state are usually yellow while the…
Chemistry · Class 12 · CBSE — Coordination Compounds
Hexacyano complexes of metals in their +2 oxidation state are usually yellow while the corresponding hexaaqua compounds are often blue or green. This is so because
- hexacyano complexes absorb orange or red light thus appear yellow while hexaaqua complexes absorb indigo thus appear yellow
- hexacyano complexes absorb indigo thus appearing yellow while hexaaqua complexes absorb orange or red light thus appear blue or green
- hexacyano complexes absorb yellow light while hexaaqua complexes absorb blue light
- CN– ions are yellow in colour while aqua ions are blue or green in colour.
Answer
(B) hexacyano complexes absorb indigo thus appearing yellow while hexaaqua complexes absorb orange or red light thus appear blue or green
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