The orange colour of and purple colour of is due to:

Question

The orange colour of  and purple colour of  is due to:

Canvas Classes · Accepted Answer

Concept: Origin of colour in transition metal compounds

transitions require partially filled d orbitals.

Charge transfer transitions occur when an electron is transferred between ligand and metal orbitals — these give intense colours even with  or  metals.

: Cr is in +6 state →  (no d electrons)
- Cannot show  transition
- Orange colour due to charge transfer (O → Cr) ✓

: Mn is in +7 state →  (no d electrons)
- Cannot show  transition
- Purple colour due to charge transfer (O → Mn) ✓

Both

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