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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    Heat of combustion \[\Delta H\] of \[C{{H}_{4}},\,{{C}_{2}}{{H}_{6}},\,{{C}_{2}}{{H}_{4}}\] and \[{{C}_{2}}{{H}_{2}}\] gases are ? 212.8, ? 373.0, ? 337.0 and ? 310.5 kcal respectively at the same temperature. The best fuel among these gases is

    A)                 \[C{{H}_{4}}\]   

    B)                 \[{{C}_{2}}{{H}_{6}}\]

    C)                 \[{{C}_{2}}{{H}_{4}}\]    

    D)                 \[{{C}_{2}}{{H}_{2}}\]

    Correct Answer: A

    Solution :

              \[C{{H}_{4}}\] is the best fuel because its calorific value \[=\frac{-212.8}{16}=-13.3\,kcal\,/\,g\] is higher among the other gases.


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