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Question

Assertion :Dipole moment of NF3 is less than that of NH3 Reason: Polarity of NF bond is less than that of NH bond

A
Assertion is true, Reason is true and Reason is the correct explanation for Assertion
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B
Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion
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C
Assertion is true, Reason is false
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D
Assertion is false, Reason is true
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Solution

The correct option is C Assertion is true, Reason is false
NH3 has a dipole moment of 1.46D and NF3 has 0.235D.
In NH3, H is less electronegative than nitrogen and hence, dipole moment of each NH bond is towards N. Now, when we take the vector sum of the three NH bonds tetrahedrally structured molecule, the dipole moment of the resultant is in the same direction as the dipole created by the nitrogen lone pair. But for NF3, as F is more electronegative than N, the resultant is opposite to that of lone pair dipole. Hence, reducing the net dipole.

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