Which one among the following is a strong acid?

NaOH

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CsCl

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HBr

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C H_{3} C O O H

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O_{2}

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Solution

The correct option is D HBr
HBr is a strong acid. In aqueous solution, it completely dissociates into ions.
$H B r \to H^{+} + B r^{-}$
$N a O H$ is a strong base.
CsCl is a salt. Acetic acid $C H_{3} C O O H$ is also a weak acid. Oxygen, $O_{2}$ is a neutral compound.

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