(A) In $OF_2$,the electronegativity of fluorine is higher than that of oxygen.Let the oxidation number of oxygen be $x$.The oxidation number of fluori

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(A) In $OF_2$,the electronegativity of fluorine is higher than that of oxygen.Let the oxidation number of oxygen be $x$.The oxidation number of fluorine is $-1$.Applying the rule for the sum of oxidation numbers in a neutral molecule:$x + 2(-1) = 0$$x - 2 = 0$$x = +2$Therefore,the oxidation number of oxygen in $OF_2$ is $+2$.