A) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
B) \[{{K}_{2}}Mn{{O}_{4}}\]
C) \[CuS{{O}_{4}}.5{{H}_{2}}O\]
D) \[MnC{{l}_{2}}\]
Correct Answer: A
Solution :
Potassium dichromate\[({{K}_{2}}C{{r}_{2}}{{O}_{7}})\]has no unpaired electrons but it is orange coloured compound.
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