A solution containing Fe2+ ions is - Pale green solution, A (dilute) solution containing Fe3+ ions is - Yellow solution, dichromate(VI) ions - Orange solution, Cu(NH₃)₄(H₂O)₂]²⁺(aq) - Dark blue solution, [Cr(NH₃)₆]³⁺(aq) - Purple solution, [Cr(H₂O)₆]³⁺(aq) - Violet solution, Mn²⁺(aq) - Pale pink solution, Cu2+ - Pale blue,

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