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NEET UG CHEMISTRY MCQ: THERMODYNAMICS
1
Medium
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Analyzing
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Statement I : When enthalpy factor is absent then randomness factor decides spontaneity of a process
Statement II : When randomness factor is absent then enthalpy factor decides spontaneity of aprocess
Statement II : When randomness factor is absent then enthalpy factor decides spontaneity of aprocess
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Correct option: C
Statement I is correct but statement II is incorrect
Option C is correct. Statement I is correct because if enthalpy is absent (ΔH=0), a positive ΔS leads to a spontaneous process. Statement II is incorrect because exothermic reactions can be non-spontaneous if randomness decreases significantly.
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Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is