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JEE Main levelSingle correct optionDifficulty 2 of 3cb046

The average formal charge on each oxygen atom in the resonance hybrid of $CO X_{3} X^{2 -}$ is

A $- \frac{1}{2}$
B $- \frac{2}{3}$
C $- 1$
D $- \frac{1}{3}$

Answer: B

The ion has a total charge of

- 2

, shared equally among three equivalent oxygens (carbon is neutral). Each oxygen carries

- 2/3

.

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