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Question

NF3 is an exothermic compound but NCl3 is an endothermic compound. Why? Explain.

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Solution

In case of NF3,NF bond strength is greater than FF bond strength whereas NCl bond strength is lower than ClCl bond strength.
Thus the formation of NF3 is spontaneous but during the formation of NCl3 energy needs to be supplied.
Hence NF3 is an exothermic compound but NCl3 is an endothermic compound.

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