Which of the following compounds show colour due to d-d transition?
(1) $CuSO _4 .5 H _2 O$
(2) $K _2 Cr _2 O _7$
(3) $K _2 CrO _4$
(4) $KMnO _4$
$CuSO _4 \cdot 5 H _2 O$
$Cu^{2+}: 3 d^{9} 4 s^{0}$
unpaired electron present so it show colour due to d-d transition.
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