The oxidation state of iodine in $H_4IO_6^-$ is

In which among the following compounds,the oxidation number of nitrogen is $ +5 $?

$KMnO_4$ acts as an oxidising agent in the neutral medium and gets reduced to $MnO_2$. What is the equivalent weight of $KMnO_4$ in a neutral medium?

The oxidation states of $P$ in $H_{4}P_{2}O_{7}$,$H_{4}P_{2}O_{5}$ and $H_{4}P_{2}O_{6}$,respectively,are:

In which of the following molecules or ions does sulphur have the minimum oxidation number?

What is the oxidation state of $S$ in $H_2SO_3$?