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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    Following reaction occurrs 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

    A) \[+,\]\[-,\]\[+\]   

    B)        \[-,\]\[+,\]\[-\]

    C) \[-,\]\[+,\]\[+\]   

    D)        \[+,\]\[+,\]\[-\]

    Correct Answer: B

    Solution :

    [b] 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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