Which of the hydrated species can exist?
I. $H_{5} O_{2}^{+}$
II. $H_{3} O^{+}$
III. $H_{3} O_{2}^{-}$
IV. $H_{7} O_{3}^{+}$
Select alternate from.

II only

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I and II

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I, II and IV

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I, II, III and IV

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Solution

The correct option is D I, II, III and IV
Water on self ionization form $H_{3} O^{+}$ . Water in strong acid also lead to the formation of $H_{5} O_{2}^{+}$ , $H_{7} O_{3}^{+}$ and water in strong alkali also lead to the formation of ${H_{3} O_{2}}^{-}$ . So all the hydrated species can exist.

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