1.

If the bond dissociation energies of \[XY,\,{{X}_{2}}\]and \[{{Y}_{2}}\] (all diatomic molecules) are in the ratio of 1 : 1 : 0.5 and \[{{\Delta }_{f}}H\] for the formation of \[XY\] is \[-200\,kJ\,mol{{e}^{-1}}\]. The bond dissociation energy of \[{{X}_{2}}\] will be         [AIEEE 2005]

A.        \[100\,kJ\,mo{{l}^{-1}}\]     
B.        \[800\,kJ\,mo{{l}^{-1}}\]
C.        \[300\,kJ\,mo{{l}^{-1}}\]     
D.        \[400\,kJ\,mo{{l}^{-1}}\]
Answer» C.        \[300\,kJ\,mo{{l}^{-1}}\]     


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