Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

(P) $F{e}^{2+}$, $F{e}^{4+}$: Both are d-block ions (2) and have 4 unpaired electrons each, giving them the same total spin and multiplicity (3).

(Q) Si, Ge: Both are p-block metalloids (1) with the same outer configuration ($n{s}^{2}n{p}^2$) (4), same multiplicity (3) due to 2 unpaired electrons, and both form acidic oxides (5).

(R) Zn, Cd: These are d-block elements (2) with the same outer configuration (4) and zero unpaired electrons, leading to the same multiplicity (3).

(S) S, Se: They share the same outer configuration ($n{s}^{2}n{p}^4$) (4), have the same multiplicity (3) with 2 unpaired electrons each, and both form acidic oxides (5).

Matching these results, the correct combination is Option (C).