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H-H, X-X and H-X bond energies are 104 ...

H-H, X-X and `H-X` bond energies are `104 Kcal//"mole" 60 Kcal//"mole"` and `101kcal//"mole"`. Assuming the electronegativity of hydrogen to be 2.1 the electronegativity of unknown element X is `(sqrt(19) = 4.36)`

A

3.5

B

3

C

4

D

2.5

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The correct Answer is:
B
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