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

H-H, X-X and H-X bond energies are 104 Kcal/mole 60Kcal/mole and 101Kc

1.	H-H, X-X and H-X bond energies are 104 Kcal/mole 60Kcal/mole and 101Kcal/ mole. Assuming the electronegativity of hydrogen to be 2.1 the electronegativity of unkonwn element X is (sqrt(19)= 4.36)
Answer» 3.5 3 4 2.5 Answer :B