Chemistry Practice Problems Calculate Oxidation Number Practice Problems Solution: Assign oxidation states for all atoms in HAsO2.

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Solution: Assign oxidation states for all atoms in HAsO2.

Problem

Assign oxidation states for all atoms in HAsO2.

Solution

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

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