Question

The oxidation number of sulphur in $N{a}_2{S}_2{O}_3$ is:

• A. $+1$
• B. $+2$
• C. $+3$
• D. $-3$

Answer 1

Answer: (B)

Suppose the oxidation number of sulphur in $N{a}_2{S}_2{O}_3$ is $x$
$\therefore 2(+1)+x+3(-2)=0$
$2+2x-6=0$
$2x-4=0$
$\therefore x=\frac{4}{2}=+2$