The oxidation number of H is +1 and of O is -2 in most compounds. Although this statement applies to most compounds, a few

Question

The oxidation number of H is +1 and of O is -2 in most compounds. Although this statement
applies to most compounds, a few important exceptions occur.
• When H forms a binary compound with a metal, the metal forms a positive ion and H
becomes a hydride ion, H. Thus, in CaH₂ the oxidation number of Ca is +2 (equal to the group
number) and that of H is -1.
Oxygen can have an oxidation number of -1 in a class of compounds called peroxides. For
example, in H₂O₂, hydrogen peroxide, H is assigned its usual oxidation number of +1, and so O
is -1.
The algebraic sum of the oxidation numbers for the atoms in a neutral compound must
be zero; in a polyatomic ion, the sum must be equal to the ion charge. For example, in HCIO,
the H atom is assigned +1 and the O atom is assigned -2. This means the Cl atom must be +7.
a. POCI3
Oxidation number =
b. C₂O42-
Oxidation number =
c. HSO4-
Oxidation number =

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