Question

# Oxidation number of fluorine in ${{F}_{2}}O$ is:(a) +1(b) +2(c) -1(d) -2

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Hint: Oxidation number is the charge of the atom it appears when present in the combined state. The element which has more electronegativity will have a more negative charge and the atom with less electronegativity will have a positive oxidation number.

In ${{F}_{2}}O$ the fluorine atom is more electronegative than the oxygen atom, hence it will have an -1 oxidation state.
Hence, the oxidation state of fluorine in ${{F}_{2}}O$ is -1 and that of oxygen is +2.