Question

The incorrect statements among the following are:

• A. $NC{l}_5$ does not exist while $PC{l}_5$ does
• B. Pb prefers to form tetravalent compounds
• C. The three $C-O$ bond are not equal in the carbonate ion
• D. Both $O_2^{+}$ and $NO$ are paramagnetic

Answer 1

Answer: (B), (C)

Pb prefers to form tetravalent compounds
The three $C-O$ bond are not equal in the carbonate ion

A) $NC{l}_5$ does not exist while $PC{l}_5$ does.

This statement is correct because $N$ does not have vacant $d-$orbitals and hence, it cannot expand its oxidation state but $P$ has vacant $d-$orbitals.

B) Pb prefers to form tetravalent compounds.

This statement is wrong because lead prefers to form bivalent compounds due to inert pair effect.

C) The three $C-O$ bond are not equal in the carbonate ion.

This statement is wrong because the three $C-O$ bonds are equal in the carbonate ion.

D) Both $O_2^{+}$ and $NO$ are paramagnetic.

This statement is correct because both contain unpaired electrons.

Hence, the correct options are $\text{B}$ and $\text{C}$