The members of which pair are most similar in color? A. chlorine, Cl2(g), and bromine,Br2(l) B. silver

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Question:

The members of which pair are most similar in color?
A. chlorine, Cl2(g), and bromine,Br2(l)
B. silver chloride, AgCl(s), and silver sulfide,Ag2S(s)
C. copper(II) chloride, CuCl2(s), and calciumchloride, CaCl2(s)
D. potassium permangenate, KMnO4(aq), and iodine,I2(g)

The answer is D. I need an explanation why based on periodic trends, on trends in the periodic table, and a method for approaching these kinds of problems about color based only on periodic table trends. Thank you very much.