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NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    Heat of combustion of \[C{{H}_{4}},\text{ }{{C}_{2}}{{H}_{4}},\text{ }{{C}_{2}}{{H}_{6}}\] are \[-890,\text{ }-1411\text{ }and\text{ }-1560\text{ }kJ/mol\]respectively. Which has the lowest calorific fuel value?

    A) \[C{{H}_{4}}\]            

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

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

    D) Same for all

    Correct Answer: B

    Solution :

    \[\Delta {{H}_{sub.}}\,\,=\,\,A{{H}_{Fusion}}+A{{H}_{vap.}}\]


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