The oxidation state of iodine in $I_3^{-}$ is:

Oxidation number of $As$ atoms in $H_3AsO_4$ is

Assertion: In some cases,oxygen exhibits a positive oxidation state. Consequently,it is an electronegative element.
Reason: Fluorine is more electronegative than oxygen.

The oxidation number of $N$ in $N_3H$ is ..........

Sum of oxidation states of bromine in bromic acid and perbromic acid is $..........$

The oxidation number of carbon in graphite is ....... .