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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2015

  • question_answer
    . In the reaction: \[S+\frac{3}{2}{{O}_{2}}\xrightarrow{{}}S{{O}_{3}}+2x\,kJ\] and \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}S{{O}_{3}}+y\,kJ\]heat of formation of \[S{{O}_{2}}\] is

    A)  \[x-y\]           

    B)  \[2x+y\]

    C)  \[x+y\]          

    D)  \[2x-y\]

    E)  None of the Above

    Correct Answer: E

    Solution :

     (None):  \[S+\frac{3}{2}{{O}_{2}}\xrightarrow{{}}S{{O}_{3}}+2x\,kJ\]...(i) \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}S{{O}_{3}}+y\,\,kJ\]    ...(ii) \[S+{{O}_{2}}\xrightarrow{{}}S{{O}_{2}}+q\,\,kJ\]                  ...(iii) Equation (iii) can be obtained by subtracting equation (ii) from (i) \[\Rightarrow \] \[q=2x-y\,kJ\] Enthalpy of formation \[(\Delta {{H}_{f}})=-q=-(2x-y)\] \[=y-2x\]


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