When ammonium nitrate is heated rapidly,an oxide of nitrogen is formed. What is the oxidation state of nitrogen in this oxide?

What is the oxidation number of Carbon in $K_{2}C_{2}O_{4}$?

The oxidation number of fluorine in $F_2O$ is

Assign oxidation number to the underlined elements in each of the following species:
$(a)$ $NaH_2\underline{P}O_4$
$(b)$ $NaH\underline{S}O_4$
$(c)$ $H_4\underline{P_2}O_7$
$(d)$ $K_2\underline{Mn}O_4$
$(e)$ $Ca\underline{O_2}$
$(f)$ $Na\underline{B}H_4$
$(g)$ $H_2\underline{S_2}O_7$
$(h)$ $KAl(\underline{S}O_4)_2 \cdot 12H_2O$

The difference in the oxidation numbers of the two types of sulphur atoms in $Na_2S_4O_6$ is

If $M$ is the molecular weight of $KMnO_4$,what will be its equivalent weight when it is converted into $K_2MnO_4$?