Question

Assertion :The equilibrium constant for the reaction ,$HONO\left(aq\right)+C{N}^{-}\left(aq\right)\rightleftharpoons HCN\left(aq\right)+ON{O}^{-}\left(aq\right)$ is $1.1\times {10}^6$ Reason: This shows that $C{N}^{-}$ is stronger base than $ON{O}^{-}$

• 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

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The equilibrium constant for the reaction ,$HONO\left(aq\right)+C{N}^{-}\left(aq\right)\rightleftharpoons HCN\left(aq\right)+ON{O}^{-}\left(aq\right)$ is $1.1\times {10}^6$
A large value of the equilibrium constant indicates that the equilibrium lies to far towards right.

An acid base reaction always results in weaker acid and weaker base.
Hence, in the given equilibrium, the base on the right is a weaker base.
This shows that $C{N}^{-}$ is a stronger base than $ON{O}^{-}$

Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.