MHTCET 25 Apr 2025 Shift 2 Paper

Concept:Oxidation number is the charge an atom appears to have when electrons are assigned to the more electronegative element.Explanation:In $\mathrm{SO}_3$, oxygen has an oxidation number of $-2$.There are $3$ oxygen atoms, so total oxygen contribution is $3 \times (-2) = -6$.Let the oxidation number of sulphur be $x$.The molecule is neutral, so the sum of oxidation numbers must be zero:$$x + (-6) = 0$$$$x = +6$$Thus, sulphur has an oxidation number of $+6$.Answer:The oxidation number of sulphur in $\mathrm{SO}_3$ is $+6$.Correct option: C. $+6$