NEETChemistryThermodynamics (C)
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The freezing of liquid water to solid ice is a spontaneous process at 263 K . Reason (R): For the freezing of water, both H and S are negative, and at 263 K , the magnitude of enthalpy change is less than the magnitude of T S ( | H| In the light of the above statements, choose the most appropriate
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
Assertion (A) is correct: The freezing point of water is 273 K . At any temperature below 273 K (such as 263 K ), the freezing of liquid water into solid ice is a spontaneous process. Reason (R) is incorrect: During the freezing of water, heat is released (exothermic, H Since both H and S are negative, we can write G = -| H| + T| S| . For G to be negative, the magnitude of the enthalpy term must be greater than the magnitude of the entropy term, i.e., | H| > |T S| . The Reason incorrectly states that | H| Therefore