The oxidation state of iron in $Na_{4}[Fe(CN)_{5}(NOS)]$ is

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:

Oxidation number of $Fe$ in the violet coloured complex $Na_4[Fe(CN)_5(NOS)]$ is:

In which of the following coordination compounds is the central metal ion in the zero oxidation state?

The molecular formula of tetraammineaquachloridocobalt$(III)$ chloride is . . . . . . .

State the $IUPAC$ name of the following complex: $[CuCl_{2}(CH_{3}NH_{2})_{2}]$