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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
                            The bond energies of H-H and \[Cl-Cl\] are \[430\text{ }KJ\text{ }mo{{l}^{-1}}\] and \[242\text{ }KJ\text{ }mo{{l}^{-1}}1\] respectively. \[\Delta {{H}_{f}}\]. for \[HCl\]is\[91\text{ }KJ\text{ }mo{{l}^{-1}}\]. The bond energy of \[HCl\] will be:

    A)  \[427\text{ }KJ\]                    

    B)  \[245\text{ }KJ\]                   

    C)  \[285\text{ }KJ\]                    

    D)  \[766\,KJ\]                  

    Correct Answer: B

    Solution :

    \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}C{{l}_{2}}\xrightarrow{{}}HCl\] \[\Delta H=91\,KJ\,mo{{l}^{-1}}\] \[\Delta {{H}_{recation}}=\left[ \frac{1}{2}BE({{H}_{2}})+\frac{1}{2}BE(C{{l}_{2}}) \right]-BE\,(HCl)\] \[91=\left[ \frac{1}{2}\times 430+\frac{1}{2}\times 242 \right]-BE(HCl)\] \[BE(HCl)=(215+121)-91=245\,KJ\,mo{{l}^{-1}}\]


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