Which of the following substances is a Bronsted-Lowry acid?

N a O H

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C H_{4}

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H_{2}

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H_{2} O

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Solution

The correct option is D $H_{2} O$
A Bronsted- Lowry acid is a species that donates a proton.
From the given solutions, none of the substances is a Bronsted- Lowry acid.
Note that $H_{2} O$ is amphoteric as it donates as well as accepts proton.
$H_{2} O + H_{2} O ⇋ O H^{-} + H_{3} O^{+}$

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N H_{3} + H_{2} O ⇌ N H_{4}^{+} + O H^{-}

H_{2} O + N H_{3} \to N H_{4}^{+} + O H^{-}

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