Which of these is incorrectly matched?

$H N O_{3}$ - acid

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$M g (O H)_{2}$ - base

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$N H_{3}$ - acid

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$N H_{4} O H$ - base

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Solution

The correct option is C
$N H_{3}$ - acid

$H N O_{3}$ is an acid as it can donate protons in water. $M g (O H)_{2}$ and $N H_{4} O H$ are bases because they can form $O H^{-}$ ions in water.

$N H_{3}$ is a base because it can accept protons in water, thus forming ${N H_{4}}^{+}$ ion.

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