The oxidation state and covalency of $S$ in $S_8$ are respectively .......

The oxidation state of $I$ in $IPO_4$ is

Among the following,the number of elements showing only one non-zero oxidation state is $O, Cl, F, N, P, Sn, Tl, Na, Ti$.

Consider the elements:
$Cs, Ne, I$ and $F$
$(a)$ Identify the element that exhibits only negative oxidation state.
$(b)$ Identify the element that exhibits only positive oxidation state.
$(c)$ Identify the element that exhibits both positive and negative oxidation states.
$(d)$ Identify the element which exhibits neither the negative nor does the positive oxidation state.

Choose the incorrect formula out of the four compounds for an element $X$ below.

Using Stock notation,represent the following compounds: $HAuCl_{4}$,$Tl_{2}O$,$FeO$,$Fe_{2}O_{3}$,$CuI$,$CuO$,$MnO$,and $MnO_{2}$.