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How would you account for the following:...

How would you account for the following:
` NCI_3` is an endothermic compound while `NF_3` is an exothermic one.

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Heat is absorbed when `NCl_3` is formed from `N_2 and Cl_2`. Heat is evolved when `NF_3` is formed from `N_2 and F_2.`
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U-LIKE SERIES-THE P-BLOCK ELEMENTS -LONG ANSWER QUESTION-I
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