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Why Sc^(3+) salts are colourless whereas...

Why `Sc^(3+)` salts are colourless whereas `Cr^(3+)` salts are coloured.

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`Sc^(3+)` salts are colourless whereas `Cr^(3+)` salts are are coloured because `Sc^(3+)` salts do not contain d-electrons at all for d-d transition.
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