Why $S c^{3 +}$ salts are colorless whereas $C r^{3 +}$ salt are coloured?

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Solution

$S c^{3 +}$ has $3 d^{0}$ outer electronic configuration with zero unpaired electrons. Hence, $S c^{3 +}$ salts are colorless.
$C r^{3 +}$ has $3 d^{3}$ outer electronic configuration with 3 unpaired electrons. Hence, $C r^{3 +}$ salt are coloured.
Note: Colour in transition metal compounds is due to presence of unpaired electrons which cause d-d transitions.

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