$N F_{3}$ is an exothermic compound but $N C l_{3}$ is an endothermic compound. Why? Explain.

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Solution

In case of $N F_{3}, N - F$ bond strength is greater than $F - F$ bond strength whereas $N - C l$ bond strength is lower than $C l - C l$ bond strength.
Thus the formation of $N F_{3}$ is spontaneous but during the formation of $N {C l}_{3}$ energy needs to be supplied.
Hence $N F_{3}$ is an exothermic compound but $N {C l}_{3}$ is an endothermic compound.

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