Which one of the following is a strong base ?

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 A NaOH
Sodium hydroxide $N a O H$ is a strong base. It completely dissociates in solution into sodium ions and hydroxide ions.
$N a O H \to N a^{+} + O H^{-}$
CsCl is a salt. HBr is a strong acid. 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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