Question

Which of the following is not a rule for calculating oxidation number?

• A. For ions, oxidation number is equal to the charge on the ion.
• B. The oxidation number of oxygen is -2 in all of its compounds.
• C. the oxidation number of fluorine is – 1 in all of its compounds.
• D. Oxidation number of hydrogen is +1 Except in binary hydrides of alkali metals and alkaline earth metals where it is -1.

Answer 1

Answer: (B)

The oxidation number of oxygen is -2 in all of its compounds.

Answer 2

: Oxidation number of oxygen is -2 in most of its compounds. The exceptions are -1 in peroxides and -1/2 in superoxides, +2 in $OF_{2}$and +1 in $O_{2}F_{2}$