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For a diatomic molecule AB, the electron...

For a diatomic molecule AB, the electronegativity difference between A and B=`0.2028 sqrt triangle where triangle`=[Bond energy of AB- Geometric mean of the bond energies of `A_2 and B_2].` The electonegativities of fluorine and chlorine are 4.0 and 3.0 respectively and the bond energies are of F-F : 38 kcal `mol^-1` and Cl-Cl : 58 kcal `mol^-1`. The bond energy of Cl-F is:

A

71 kcal/mol

B

61 kcal/mol

C

48 kcal/mol

D

75 kcal/mol

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A
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