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

BF 3 is planar but NF 3 : is pyramidal in shape

BF 3 is planar but NF 3 : is pyramidal in shape

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

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

BF₃ is planar but NF₃: is pyramidal in shape

Boron is a metalloid while nitrogen is a non-metal

Atomic size of boron is smaller than that of nitrogen

answer is B.

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BF₃ is planar, hence the dipole moment of the molecule is zero.
NF₃ is pyramidal, thus it possesses dipole moment. Hence, NF₃is a polar compound.

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