Question

Assertion: Aqueous solution of $C{{H}_{3}}COON{{H}_{4}}$ is found to be neutral.
Reason: This salt does not undergo hydrolysis.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer 1

Hint: When the salt $C{{H}_{3}}COON{{H}_{4}}$ is dissociated, then the constituent acid and bases which are formed in equilibrium are $C{{H}_{3}}COOH$ and $N{{H}_{4}}OH$, which are both weak. This will help in identifying the nature of the salt.

Complete step by step answer:
In order to answer our question, we need to learn about the types of salts formed using different acids and bases. We know that when an acid is mixed with a base then a salt is formed, along with the formation of water. Now, there are some acids called strong acids and acids named as weak acids. When an acid is called strong, that means that that particular acid has a lot of ${{[H]}^{+}}$ in it. Weak acids have less ${{[H]}^{+}}$ concentration. Similarly, talking about bases, the substances which have more ${{[OH]}^{-}}$ are strong bases, and vice versa. When these are mixed, four types of combination are formed:
i. Salts of strong acid and strong bases $(NaCl)$, have resultant pH=7
ii. Salts of strong acid and weak base $(N{{H}_{4}}N{{O}_{3}})$, have resultant pH<7
iii. Salt of strong bases and weak acids $(N{{a}_{2}}C{{O}_{3}})$, have resultant pH>7
iv. Salts of weak acid and weak bases $(C{{a}_{3}}{{(P{{O}_{4}})}_{2}})$
Now, the dissociation of $C{{H}_{3}}COON{{H}_{4}}$ looks like:
\[\begin{align}
& C{{H}_{3}}COON{{H}_{4}}+{{H}_{2}}O\rightleftharpoons C{{H}_{3}}COOH+N{{H}_{4}}OH \\
& C{{H}_{3}}CO{{O}^{-}}+N{{H}_{4}}^{+}+{{H}_{2}}O\rightleftharpoons C{{H}_{3}}COOH+N{{H}_{4}}OH \\
\end{align}\]
So, both are weak acid and weak base, solution is found to be neutral, and it dissociates. So, the assertion is correct but the reason is wrong.

So the correct answer is option C.

Note: It is to be noted that since both the cations and anions of the salt have participated in the hydrolysis, it is known as cationic as well as anionic hydrolysis. The nature of the solution or its pH depends upon the relative strengths of the acid and base that are formed on hydrolysis.