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The dipole moment follows the trend NH3 > PH3 > AsH3 > SbH3 due to differences in electronegativity.

1. Correct
2. Incorrect
3. Indeterminate
4. Not applicable

Correct answer: Correct

Solution

The dipole moment decreases in the order NH3 > PH3 > AsH3 > SbH3 because the electronegativity of the central atom decreases down the group, reducing the bond polarity and hence the dipole moment.

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