Question

Oxidation number of $S$ in $H_{2}S_{2}O_{8}$ is

• A. 2
• B. 4
• C. 3
• D. 6

Answer 1

Answer: (D)

6

Answer 2

The structure of $H _{2} S _{2} O _{8}$ is as It contains peroxide linkage due to which the oxidation number of these two oxygen atoms will be $-1$ each. $2 \times(+1)+2 x +6 \times(-2)+2(-1)=0$ $2+2 x-12-2=0$ or $2 x=12$ $\because x=+6$