Which of the following is not a base according to any of the theories?

M g {(O H)}_{2}

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{N H}_{3}

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H_{2} {P O}_{4}^{-}

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{B F}_{3}

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Solution

The correct option is D ${B F}_{3}$
$B F_{3}$ is an acid according to the Lewis acid-base theory, as it can accept an electron pair from a donor compound. According to this theory, $N H_{3}$ is an electron-pair donor or base. $M g (O H)_{2}$ and $H_{2} P O_{4}^{-}$ are Bronsted bases.

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