The oxidation number of $C$ in $C_6H_{12}O_6$ is:

The oxidation states of $Cr$ in $K_2Cr_2O_7$ and $CrO_5$ are, respectively:

The oxidation number of carbon in $CH_2O$ is

Which metal in the following compounds is not present in a fractional oxidation state?

$A, B,$ and $C$ are three elements forming a compound in which their oxidation states are $+2, +5,$ and $-2$ respectively. If the compound is neutral,which of the following represents the formula of the compound?

Oxidation number of $N$ in $HNO_3$ is