Assign oxidation numbers to all species in the redox reactions below. Identify the oxidizing and reducing agents.

Question

1. Fe(OH)2 (s) + CrO42- (aq) → Fe2O3(s) + Cr(OH)4-(aq) (basic)

Answer 1

Fe is +2 on left and +3 on right. Cr is +6 on left and +3 on right
Oxidation is loss of electrons; the material oxidized is the reducing agent.

Reduction is gain of electrons; the material reduced is the oxidizing agent.