Chemistry · THERMODYNAMICS

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): For chemical reactions involving only condensed phases (solids and liquids), the difference between \( \Delta H \) and \( \Delta U \) is usually very large. Reason (R): Solids and liquids do not suffer any significant volume changes upon heating or during reaction. In the light of the above statements, choose the correct answer from the options given below:

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.