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Select the correct statement with reference to molecules BF3 and NH3 

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a
BF3 and NH3 have same dipole moment
b
Dipole moment of NH3 is smaller than that of BF3
c
BF3 molecule has a planar structure, while the NH3 molecule is pyramidal
d
The nitrogen atom has lone pair of electrons, while the boron atom has a free (vaccant) valence orbital

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detailed solution

Correct option is C

Symmetrical molecule BF3  show zero dipole moment. Unsymmetrical molecule NH3 show non zero dipole moment.

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