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AMU Medical AMU Solved Paper-2003

  • question_answer
    Bond energy is highest for

    A)  Ge?Ge                             

    B)  C?C

    C)  Sn?Sn                               

    D)  Si?Si

    Correct Answer: B

    Solution :

                     Key Idea In a group from top to bottom the strength of M?M bond decreases due to increase in the size of the atom. In the group 14 elements (C, Si, Ge, Sn), the size of the atomic radius is in the order of\[Sn>Ge>Si>C\]. The size of the carbon is smallest in the group therefore, bond energy is highest for C?C. The energies of various bonds are following               
    Bond C - C Si - Si Ge- Ge Sn - Sn
    Bond energy 353.3 225.7 167.2 154.2
                    \[(kJ\,\,mo{{l}^{-1}})\]


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