The rules for oxidation states are as follows:
For hydrogen: O.S. = +1 with nonmetals
O.S. = –1 with metals
For oxygen: O.S. = –1 in peroxides (X2O2, X = Group 1A element)
O.S. = –1/2 in superoxides (XO2, X = Group 1A element)
O.S. = –2 in all other compounds
Assign oxidation states for all atoms in HAsO2.
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