In acidic medium,$H_2O_2$ changes $Cr_2O_7^{2-}$ to $CrO_5$ which has two peroxy linkages. The oxidation state of $Cr$ in $CrO_5$ is

The correct order of the oxidation states of nitrogen in $NO$,$N_2O$,$NO_2$,and $N_2O_3$ is:

Write the oxidation number of the carbon atom in the carboxyl group of acetic acid $(CH_3COOH)$.

Oxidation states of $P$ in $H_{4}P_{2}O_{5}, H_{4}P_{2}O_{6}, H_{4}P_{2}O_{7}$ are respectively:

What is the oxidation number of $As$ in $H_{3}AsO_{3}$?

One mole of $N_2H_4$ loses $10 \ moles$ of electrons to form a new compound $Z$. Assuming that all the nitrogen atoms appear in the new compound, what is the oxidation state of nitrogen in $Z$? (There is no change in the oxidation state of hydrogen.)