Question

Which given pair is isosteres?

• A. $ClO_{4}^{-}$ and $OCN^{-}$
• B. $NO_{2}^{-}$ and $PO_{4}^{3 -}$
• C. $CO_{2},N_{2}O,NO_{3}^{-}$
• D. $NO_{2}^{-}$ and $O_{3}$

Answer 1

Answer: (D)

Isosteres are atoms, molecules or ions containing the same number of atoms and valence electrons. $NO_{2}^{-}$ and $O_{3}$ are isostere. The number of atoms in these $\left(\right.=3\left.\right)$ and number of electrons $\left(\right.\text{24}\left.\right)$ are same.