In a reaction, 4 moles of electrons are transferred to one mole of HNO3. The possible product obtained due to reduction is

(a) 0.5 mole of N2.

(b) 0.5 mole of N2O.

(c) 1 mole of NO2.

(d) 1 mole of NH3.

choose and explain?

I first looked at the oxidation number of nitrogen in the HNO3. It is +5 due to the -6 from the oxygen and the +1 from the hydrogen. Then I looked at the oxidation numbers of nitrogen in your choices. in N2 it is 0, N2O is +1, +4 in NO2 and -3 in NH3. So each change in oxidation number needs 1 mole of electrons per mole of product. (a) needs 5 moles (5 electrons per N, times 2 to get N2 and then 0.5 moles = 5. And so on. So the answer is (b), change in oxidation number is 4, 2 nitrogens to get N2O 0.5 moles = 4 moles of electrons. (c) only needs one mole of electrons to change to +4 and (d) would need 8 moles.

approve plz!