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Which of the following molecules has the maximum dipole moment?

1. CO2
2. CH4
3. NH3
4. NF3

Correct answer: NH3

Solution

NH3 has the maximum dipole moment because its trigonal pyramidal structure results in a net dipole moment due to the lone pair on nitrogen. CO2 and CH4 are non-polar, and NF3 has a lower dipole moment due to the opposing dipole contributions of fluorine atoms.

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