[AIIMS 1983, 85; CBSE PMT 1994; MP PET 2002]
A) $ O_2 $
B) $ O_2^{-1} $
C) $ O_2^{+1} $
D) $ O_2^{-2} $
Correct Answer: C
B.O. of $ O_2 $ is 2, B.O. of $ O_2^{-1} $ is 1.5, B.O. of $ O_2^{+1} $ is 2.5 and of $ O_2^{2-} $ is 1.
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