A substance is carried out through the given transformations.
The equation
1
is true only if the steps are carried out reversibly
2
is always true because entropy is a state function
3
may be true but need more information
4
is incorrect
Official Solution
Correct Option: (2)
Concept:
Entropy ( ) is a state function, meaning its change depends only on initial and final states, not on the path. Step 1: Identify paths: A → B → C and A → D → E → C represent different paths between same states. Step 2: Since entropy is a state function, total change is independent of path taken. Step 3: Hence, sum of entropy changes along both paths must be equal. Conclusion:
The given relation is always true.
02
PYQ 2014
medium
chemistryID: met-2014
At 298 K, the entropy of rhombic sulphur is 32.04 J mol K and that of monoclinic sulphur is 32.68 J mol K . The heats of combustion are respectively and J mol . for the reaction: S S will be
1
107.28 J
2
10.728 J
3
107.28 kJ
4
10728 J
Official Solution
Correct Option: (1)
Concept: Step 1: Calculate entropy change:
Step 2: Calculate enthalpy change using heats of combustion:
Step 3: Substitute in Gibbs equation at : Conclusion:
J
