Describe an oxidation-reduction reaction. in an oxidation-reduction reaction, oxidation is what happens when a reactant [gains electron, loses electrons, releases oxygen] . reduction occurs when a reactant [gains electron, loses electrons, acquires oxygen] in the reaction.

Ibelieve the answer is d

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -