Which anion is the weakest base?

C_{2} H_{5} O^{-}

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{N O}_{3}^{-}

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F^{-}

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{C H}_{3} {C O O}^{-}

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Solution

The correct option is B ${N O}_{3}^{-}$
Conjugated base of a stronger acid is weak. The corresponding acids of the given conjugated bases are as (in order of acidity)
$C_{2} H_{5} O H < {C H}_{3} C O O H < H F < {H N O}_{3}$
$∴$ The order of basicity is
$C_{2} H_{5} O^{-} > {C H}_{3} C O O > F^{-} > {N O}_{3}^{-}$
Thus, ${N O}_{3}^{-}$ is the weakest base among the given.

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