Indicate oxidants and reducing agents, oxidation and reduction processes in the reaction equations: a) O2 + 2H2 = 2H2O;

Indicate oxidants and reducing agents, oxidation and reduction processes in the reaction equations: a) O2 + 2H2 = 2H2O; b) FeO + H2 = Fe + H2O; c) N2 + 3H2 = 2NH3.

The reducing agent gives up electrons (oxidation process), the oxidizing agent accepts (reduction), then:
a) oxygen lowers its charge, that is, it accepts electrons, is an oxidizing agent, a reduction process; hydrogen increases its charge, that is, it gives up electrons, is a reducing agent, an oxidation process;
b) iron – oxidizing agent, reduction; hydrogen – reducing agent, oxidation;
c) nitrogen – an oxidizing agent (in ammonia, the oxidation state is -3, many are confused about this), reduction; hydrogen – reducing agent, oxidation