Oxygen
O.S. = –1 in peroxides (X2O2, X = Group 1A)
O.S. = –1/2 in superoxides (XO2, X = Group 1A)
O.S. = –2 in other compounds
The oxidation number of oxygen when it is in a compound other than a peroxide is ____.
A) -2
B) -1
C) 0
D) +2
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