In the compound `NOClO_(4)` ,the oxidation state

" In the compound NOCIO_(4) the oxidation state of N is "

In the compound NCl_(3) , negative oxidation state is exhibited by

One mole of N_(2)H_(4) loses ten moles of electrons to form a new compound A . Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in A ? (There is no change in the oxidation state of hydrogen.)

Name the compound of N with oxidation state -3 " and " +2 .