The table shows bond energies for some diatomic molecules. Deuterium, D, is an isotope of
hydrogen.
Which statements are correct?
1 Diatomic molecules have exact values for their bond energies, which are always
positive.
2 The trend in Group 7 bond energies can be explained by the variation in instantaneous
dipole–induced dipole (id–id) forces.
3 A value for the enthalpy change for the reaction between deuterium and chlorine can
be calculated using these data alone.
1 only
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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