Question

Which one of the following species has plane triangular shape?

• A. $N_3$
• B. $NO_3^-$
• C. $NO_2^-$
• D. $CO_2$

Answer 1

Answer: (B)

$NO_3^-$

Answer 2

Species with $sp^2$ hybridisation are plane triangular in shape. Among the given species $NO_3^-$ is $sp^2$ hybridised with no lone pair of electrons on central atom, N. Whereas, $N_3$, $NO_2^-$ and $C0_2$ are sp hybridised with a linear shape.