Explain ions is least likely to form colored compounds

Reference no: EM13342607

Which of the following ions is least likely to form colored compounds? a)Mn^2+ b)Cr^5+ c)Sc^3+ d)Fe^3+ e)Co^2+ I know the answer is C but I do not know why. Can someone please explain to me the trends or reasoning behind this?

Reference no: EM13342607

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