Question

Assertion :For a reaction, $2N{H}_3\left(g\right)⟶N_2\left(g\right)+3H_2\left(g\right)$

$△H>△E$

Reason: Enthalpy change is always greater than internal energy change.

• 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 C Assertion is correct but Reason is incorrect.

For given reaction $△H>△E$

because $\{△H=△E+△nRT\}$.

In this reaction $△n_{\left(g\right)}=\left[\right(3+1)-2]=+2$

So, $△H>△E$.

Thus, the Assertion is correct.

In some cases, the enthalpy change may be less than internal energy change (in these cases $△n_{\left(g\right)}$, is negative)

So, the Reason is incorrect.