Statement – I: $H_{3} {PO}_{4}$ acts as an acid, according to Arrhenius theory.
Statement – II: $Ca {(OH)}_{2}$ acts as a base, according to Arrhenius theory.
Statement – III: ${NH}_{3}$ acts as a base, according to Arrhenius theory.

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A, B, C are incorrect

All A, B, C are correct

A, B are correct and C is incorrect

A, B are incorrect and C is correct

answer is C.

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Detailed Solution

An acid is a substance which produces hydrogen ions when dissolved in water. A base is a substance which produces hydroxyl ions when dissolved in water.

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