Chemistry - Complete s-block Question with Solution | TestHub

Peroxides (${O_2}^{2-}$) have 18 electrons (T) and are diamagnetic (P) because all electrons are paired in the molecular orbitals.

Superoxides (${O_2}^{-}$) have 17 electrons (S), a bond order of 1.5 (R), and are paramagnetic (Q) due to one unpaired electron.

Oxides ($O^{2-}$) and Hydroxides (${OH}^{-}$) both achieve stable, fully paired electron configurations (10 electrons total), making them diamagnetic (P).

Final Match: A $\to$ P, T; B $\to$ Q, R, S; C $\to$ P; D $\to$ P.