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Which compound forms a colored aqueous solution?
a) CaCl2 c) NaOH
b) CrCl3 d) KBr

i think its Cr because its an transition metal. but im not sure.

  • Chemistry -

    It is Cr and the reason is that it has unpaired electrons. The electron configuration for the neutral element is
    1s2 2s2 2p6 3s2 2p6 3d5 4s1 and when you mak the 3+ ion (as in CrCl3), you take off the last three electrons to give you
    [Ar]3d3. Remember the d orbital has five lobes
    _ _ _ _ _
    x x x
    The x stands for an electrons. In fact, almost any way you slice it, Cr has unpaired electrons for almost everything.

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