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

  • question_answer
    Following reaction occurrs in an automobile \[2{{C}_{8}}{{H}_{18}}\left( g \right)+25{{O}_{2}}\left( g \right)\to 16C{{O}_{2}}\left( g \right)+18{{H}_{2}}O\left( g \right).\]The sign of \[\Delta H,\Delta S\] and AG would be

    A) \[+,-,+\]                       

    B) \[-,+,-\]

    C) \[-,+,+\]                       

    D) \[+,+,-\]

    Correct Answer: B

    Solution :

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


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