Transition metal complexes absorb visible light only when they have an incomplete d sub shell. In [Cr(NH3)6]3+, Cr is present in +3 state. Its electronic configuration- +3 3 0 Cr =[Ar]3d 4s As it has the 3 unpaired electrons therefore electrons excitation is possible and therefore it will be absorb visible light. Hence, the correct option is (c).
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