Which one of the following compounds is a protonic acid?

S O_{2} (O H)_{2}

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B (O H)_{3}

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P O (O H)_{3}

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S O (O H)_{2}

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Solution

The correct options are
A $P O (O H)_{3}$
B $S O (O H)_{2}$
C $S O_{2} (O H)_{2}$
$S O_{2} (O H)_{2}$ , $P O (O H)_{3}$ and $S O (O H)_{2}$ are protonic acids. They provide $H^{+}$ ions in water.
$B (O H)_{3}$ does not provide $H^{+}$ ions in water instead it accepts $O H^{-}$ ion and hence it is Lewis acid.
$B (O H)_{3} + H_{2} O ⇌ {[B (O H)_{4}]}_{4}^{-} + H^{+}$

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