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NEET UG CHEMISTRY MCQ: THERMODYNAMICS
1
Hard
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Analyzing
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Statement I: A reaction which is spontaneous and
accompanied by decrease of randomness must be
exothermic.
Statement II: All exothermic reactions are
accompanied by decrease of randomness.
accompanied by decrease of randomness must be
exothermic.
Statement II: All exothermic reactions are
accompanied by decrease of randomness.
View answer and explanation
Correct option: C
If Statement I is CORRECT, but Statement II is INCORRECT
Option C is correct. Statement I is correct because for a spontaneous reaction with decreasing randomness (negative ΔS), the reaction must be exothermic (negative ΔH) to ensure ΔG is negative. Statement II is incorrect because not all exothermic reactions decrease randomness.
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Reason :- During phase transition work done is always negative. For the reaction, at . Hence, is