Which of the following has no unpaired electrons but is coloured?

Chemistry · Class 12 · CBSE — The d- and f-Block Elements

1. K₂Cr₂O₇
2. K₂MnO₄
3. CuSO₄·5H₂O
4. MnCl₂

Answer

(A) K 2 Cr 2 O 7

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