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Q.

Statement I: NH3 has higher dipole moment than NF3.
Statement II : F has more electro negativity than hydrogen.

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a

Statement I and Statement II are true.

b

Statement I is false and Statement II is true.

c

Statement I is true and  statement II is false.

d

Statement I and Statement II are false.

answer is A.

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Detailed Solution

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A lone pair is assumed to be an electro negative atom
In NH3 all dipoles allign with each other
 

 

μ is high.
 

Question Image


In  NF3 the vectorial sum of bond dipoles is some what compensated by the dipole by lone pair.
μ is less.
Conclusion
Though electronegativity of F > H (on pauling scale) the dipolement of NH3>NF3
I and II are true

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Statement I: NH3 has higher dipole moment than NF3. Statement II : F has more electro negativity than hydrogen.