[CBSE PMT 1998; BHU 2001]
A) $ T{{i}^{4+}} $
B) $ C{{u}^{+}} $
C) $ Z{{n}^{2+}} $
D) $ C{{r}^{3+}} $
Correct Answer: D
$ C{{r}^{+3}} $ due to presence of unpaired electrons.
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