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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    Which of the following pairs of processes is certain to occur in a spontaneous chemical reaction?

    A) Exothermic and increasing disorder

    B) Exothermic and decreasing disorder

    C) Endothermic and increasing disorder

    D) Endothermic and decreasing disorder

    Correct Answer: A

    Solution :

    [a] Measure of disorder of a system is nothing but entropy. For a spontaneous reaction, \[\Delta G<0\]. As per Gibbs Helmholtz equation, \[\Delta G=\Delta H-T\Delta S\] Thus \[\Delta G\]is \[-ve\] only when \[\Delta H=-ve\](exothermic) and  \[\Delta S=+ve\] (increasing disorder)


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