1) The difference in the oxidation numbers of the two types of sulphur atoms in $Na_{2}S_{4}O_{6}$ is A) 4 B) 3 C) 5 D) 2 Answer: Option CExplanation:$Na_{2}S_{4}O_{6}$is a salt of $H_{2}S_{4}O_{6}$ which has the following structure $\Rightarrow$ Difference in oxidation number of two types of sulphur = 5
