Question

Please answer both the parts ..

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Answer 1

Explanation:

1. Nitrogen is chemically less reactive → This is because of the high stability of its molecule, N2. In N2, the two nitrogen atoms form a triple bond. This triple bond has very high bond strength, which is very difficult to break. It is because of nitrogen's small size that it is able to form pπ-pπ bonds with itself. This property is not exhibited by atoms such as phosphorus. Thus,phosphorus is more reactive than nitrogen.
2. .The enthalpy of formation of NCl3 is due to the large size difference of N and Cl atoms as N belongs to second period and Cl belongs to the third period making the N-Cl bond weak, whereas in  NF3, since both the atoms belongs to the second period & are small in size therefore N-F bond is strong making it exothermic.

Answer 2

Answer:

(i)It's because

----> Nitrogen is small as compared to Phosphorus

---->Hence because of above reason we require high bond dissociation energy to break the bond between N-N triple bond

(ii)From the word exothermic compound it is clear that the compound would give out a lot of energy why let's see......

It's because N and F both are of nearly same size hence N-F bonding is strong as both are of small size.

Endothermic compound mainly here for me it means the compound which couldn't be able to give out energy...let's see why

It's because N and Cl has a big difference in size...where N is small and Cl is big.Hence bonding is not so strong between them