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Q.

Both BF3  and  NF3 are covalent compounds. BF3 is a non-polar compound but NF3 is polar. The reason is that

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a

Boron is a solid and nitrogen is a gas in free state

b

BF3 is planar but NF3 is pyramidal in shape

c

Boron is a metalloid while nitrogen is a non-metal

d

Atomic size of boron is smaller than that of nitrogen

answer is B.

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Detailed Solution

BF3 is planar, hence the dipole moment of the molecule is zero.  NF3 is pyramidal, thus it possesses dipole moment.

Hence, NF3 is a polar compound.

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