Ncert Exercises & Solutions

Which of the following statements is wrong?

1.	Single N—N bond is stronger than a single P—P bond.
2.	${PH}_{3}$ can act as a ligand in the formation of coordination compound with transition elements.
3.	${NO}_{2}$ is paramagnetic in nature.
4.	Covalency of nitrogen in $N_{2} O_{5}$ is four.

Hint: Phosphorus forms allotropes but nitrogen does not.

The true statement is that a single N — N bond is weaker than a single P —P bond because of high interelectronic repulsion of the non-bonding electrons in N₂, owing to the small bond length. This is why phosphorous shows allotropy but nitrogen does not.

The bond energy of N-N is 167 kJ mol^-1, and for P-P is 201 kJ mol^-1.

(i) PH₃, acts as a ligand in the formation of coordination compound due to the presence of lone pair of electrons.

(i) ${NO}_{2}$ is paramagnetic in nature due to the presence of one unpaired electron. The structure of ${NO}_{2}$ is

(li) Covalency of nitrogen in $N_{2} O_{5}$ is 4

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