Write a balanced net ionic equation for each of the following reactions:
(a) Dilute nitric acid reacts with zinc metal with formation of nitrous oxide.
(b) Concentrated nitric acid reacts with sulfur with formation of nitrogen dioxide.
(c) Concentrated nitric acid oxidizes sulfur dioxide with formation of nitric oxide.
(d) Hydrazine is burned in excess fluorine gas, forming NF3.
(e) Hydrazine reduces CrO42- to Cr(OH)4- in base (hydrazine is oxidized to N2).