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BF(3) and NF(3) both are covalent compou...

`BF_(3) and NF_(3)` both are covalent compounds but `NF_(3)` is polar whereas `BF_(3)` is non-polar. This is because :

A

Boron is a metal nad nitrogen is a gas in uncomined state

B

BF bonds have no dipole moment where as NF bonds have dipole moment

C

Atomic size of boron is smaller than of nitrogen

D

`BF_(3)` is polar but ` NF_(3)` is pyramidal in shape

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The correct Answer is:
d
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A polar covalent bond with positive and negative charge centres at its ends is called a dipole. The polarity of a dipole is measured by its dipole moment. Mathematically it is expressed as dipole moment, mu=q xx d where q and d are the net charge and the distance between the two charges respectively. Dipole moment is a vector quantity. The net dipole moment of a polyatomic molecule is the resultant of the various bond moments present in the molecule. The values of dipole moment are expressed in Debye (D) or in SI units in terms of coulomb- metre (Cm). One of the most important applications of dipole moment is in the determination of geometry and shape of molecules besides prediction of a number of properties of the molecules. The molecules BF_3 and NH_3 both are covalent compounds but BF_3 is non-polar while NF_3 is polar . The reason is that

BF_(1) and NF_(3) both molecules, are covalent, but BF_(3) is non - polar and NF_(3) pole. Its reason is

The BF_3 is a planar molecule where as NF_3 is pyramidal because :

The BCl_3 is a polar molecule whereas NCl_3 is pyramidal because

MARVEL PUBLICATION-NATURE OF CHEMICAL BOND -TEST YOUR GRASP
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