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11th Class Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    Following reaction occurring in an automobile \[2{{C}_{8}}{{H}_{18}}(g)+25{{O}_{2}}(g)\to 16C{{O}_{2}}(g)+18{{H}_{2}}O(g).\] The sign of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be               [CBSE PMT 1994; KCET 1999]

    A)                 +, ?, +  

    B)                 ?, +, ?

    C)                 ?, +, +  

    D)                 +, +, ?

    Correct Answer: B

    Solution :

              For Combustion reaction, \[\Delta H\] is negative, \[\Delta n=(16+18)-(25+2)=+7\], so \[\Delta S\] is \[+ve\], reaction is spontaneous, hence \[\Delta G\] is ?ve.


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