Question

Which of the hydrated species may exist?
I : $H_5{O}_2^{+}$
II : $H_3{O}^{+}$
III : $H_5{O}_2^{-}$
IV : $H_7{O}_3^{+}$

• A. II only
• B. 1 and II
• C. I, II and IV
• D. I. II. III and IV

Answer 1

The correct option is C I, II and IV

$H^{+}+H_{2}O⟶H_3{O}^{+}\stackrel{H_{2}O}{\to }{H}_5{O}_2^{+}\stackrel{H_{2}O}{\to }{H}_7{O}_3^{+}$

$H^{+}$ in aqueous solution can combine with $H_{2}O$ molecules and can exist as various kinds of hydrated species.