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\( \mathrm{BF}_{3} \) and \( \mathrm{NF}_{3} \) both are covalent compounds but \( \mathrm{NF}_{3} \) is polar whereas \( \mathrm{BF}_{3} \) is non-polar. This is because :
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(a) Nitrogen atom is smaller than boron atom
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(b) \( \mathrm{N}-\mathrm{F} \) bond is more polar than \( \mathrm{B}-\mathrm{F} \) bond
(c) \( \mathrm{NF}_{3} \) is pyramidal whereas \( \mathrm{BF}_{3} \) is planar triangular
(d) \( \mathrm{BF}_{3} \) is electron deficient whereas \( \mathrm{NF}_{3} \) is not
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