Question

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

Answer 1

${H^ + }$ in aqueous solution can combine with ${H_2}O$ molecules and can exist as various kinds of hydrated species.

Complete Answer:
Water on the self-ionization forms the ${H_3}{O^ + }$Water in strong acid also carry forward to the formation of ${H_3}{O^{2 - }}$, ${H_7}{O^{3 + }}$and water in the strong alkali also carry forward to the formation of ${H_3}{O^{2 - }}$. So all the hydrated species can exist. Water on self-ionization form ${H_3}{O^ + }$ions. Water in strong acid also carry forward to formation of ${H_5}{O^{2 + }}$, ${H_3}{O^{2 - }}$ and ${H_7}{O^{3 + }}$. In strong acid ${H_3}{O^ + }$ is unstable. The chemical state of the water varies extremely between different classes of hydrates, some of which actually are so labeled before their chemical structure was understood. Hydration is possible in every state. All the states can be present in hydrated form or can be converted into hydrated form. They can exist in strong acid or strong alkali. The chemical state of these compounds is extremely important. Chemical structure is also as well a very important thing to acknowledge while confirming the ability of hydration of the compound. Hydration is one of the absolute important properties of all the compounds mentioned in the question. All the compounds can possibly be hydrated or can follow or go through hydration.
So, as we know hydration of all the compounds given is possible and hydration can take place in all the compounds mentioned.

So, the correct answer is (D) that is I, II, III, IV.

Note: ${H_5}{O^{2 + }}$exist in hydrated form in strong acid obviously similarly every other option which is ${H_3}{O^ + }$, ${H_3}{O^{2 - }}$and ${H_7}{O^{3 + }}$.