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Haryana PMT Haryana PMT Solved Paper-2000

  • question_answer
    Given, (i) \[C+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}};\,\,\Delta {{H}^{o}}=-xkJ\] (ii) \[2C+{{O}_{2}}\xrightarrow{{}}2C{{O}_{2}};\Delta =-ykJ\] The enthalpy of formation of \[C{{O}_{2}}\] will be:

    A)  \[2x-y\]              

    B)  \[y-2x\]

    C)  \[\frac{(2x-y)}{2}\]                        

    D)  \[\frac{(y-2x)}{2}\] 

    Correct Answer: D

    Solution :

    Sol.         \[C(s)+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}(g)\]                            ...(i) \[2C+{{O}_{2}}+2C{{O}_{2}}\]                                                                     ...(ii) Dividing equation (ii) by 2 and then subtracting from equation (i), we get


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