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The dipole moments of diatomic molecules AB and CD are 10.41 D and 10.27 D, respectively while their bond distances are 2.82 and 2.67 Å, respectively. This indicates that

1. bonding is 100% ionic in both the molecules
2. AB has more ionic bond character than CD
3. AB has lesser ionic bond character than CD
4. bonding is nearly covalent in both the molecules

Correct answer: AB has more ionic bond character than CD

Solution

Dipole moment is directly proportional to the product of charge and bond distance. Since AB has a slightly higher dipole moment and bond distance than CD, it indicates that AB has a greater ionic character than CD.

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