Question

(A) In a gaseous reaction, $K_c$ is unitless when $\Delta n=0$.
(R) Unit of $K_c=\left(mol{L}^{-1}\right)$.

• A. Both (R) and (A) are true and reason is the. correct explanation of assertion
• B. Both (R) and (A) are true but reason is not correct explanation of assertion
• C. Assertion (A) is true but reason (R) is false
• D. Assertion (A) and reason (R) both are false
• E. Assertion (A) is false but reason (R) is true

Answer 1

Answer: (A)

Both (R) and (A) are true and reason is the. correct explanation of assertion

We have:-

$A\left(g\right)+B\left(g\right)\rightleftharpoons C\left(g\right)+D\left(g\right)$

Here, $△n=0,K_C=\frac{\left[C\right]\left[D\right]}{\left[A\right]\left[B\right]}$

$K_C$ is unit less here.

The unit of $K_C$ is ${molL}^{-1}$ for $△n=1$

Both (R) and (A) are true and reason is the correct explanation of assertion

Hence option A is correct.