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(A) The stability of nitrogen trihalides decreases as the size of the halogen atom increases.The bond energy of the $N-X$ bond decreases from $F$ to $

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$NF_{3}$

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(A) The stability of nitrogen trihalides decreases as the size of the halogen atom increases.The bond energy of the $N-X$ bond decreases from $F$ to $I$ due to the increasing mismatch in the size of the orbitals of $N$ and $X$ atoms.Therefore,the order of stability is: $NF_{3} > NCl_{3} > NBr_{3} > NI_{3}$.Thus,$NF_{3}$ is the most stable trihalide.

The most stable trihalide of nitrogen is ..... .

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