The oxidation state of $Fe$ in the brown ring complex $[Fe(H_2O)_5NO]SO_4$ is

Identify the pair of compounds in which both metal atoms are in their maximum oxidation state.

Which of the following name-formula combinations is not correct?

Identify true and false statements:
$(a)$ In the reaction $F_2 + O_2 \to O_2F_2$,oxygen is an oxidising agent.
$(b)$ Among $HClO, HClO_2, HClO_3$ and $HClO_4$,$HClO_2$ is the strongest acid.
$(c)$ Oxidation state of Nickel in $[Ni(CO)_4]$ is zero.
$(d)$ The reaction $BaO_2 + H_2SO_4 \to BaSO_4 + H_2O_2$ is a redox reaction.
The correct order of truth values is:

The oxidation number of iron in the compound $K_4[Fe(CN)_6]$ is

What is the oxidation state of cobalt in the complex $[Co(NH_3)_6]^{3+}$?