Which of the following will form a weak acid when dissolved in water?

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 $C H_{3} C O O H$
Acetic acid $C H_{3} C O O H$ will form a weak acid when dissolved in water.
$C H_{3} C O O H \to C H_{3} C O O^{-} + H^{+}$
NaOH is a strong base.
CsCl is a salt. HBr is a strong acid. Oxygen, $O_{2}$ is a neutral compound.

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