What is the oxidation number of sulfur in $\mathrm{H}_2 \mathrm{SO}_5$ ?
- $+4$
- $+6$
- $+8$
- $+5$
Solution
It has a peroxide linkage.
$\begin{aligned}
& (2 \times 1)+x+(3 \times-2)+(2 \times-1)=0 \\
\therefore \quad & x=+6
\end{aligned}$Asked in: MHT CET 2023 (11 May Shift 2)