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Which of the following arrangements of molecule is correct on the basis of their dipole moments?

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${NH}_{3} < {BF}_{3} > {NF}_{3}$

${NH}_{3} > {NF}_{3} < {BF}_{3}$

${BF}_{3} < {NH}_{3} > {NF}_{3}$

${NF}_{3} < {BF}_{3} > {NH}_{3}$

answer is A.

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Detailed Solution

In NF₃ molecule D.M due to lone pair and F act in opposite directions and cancel each other while in NH₃ it acts in one direction only.
Hence D.M of NH₃is more than NF₃.

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