1)In which of the following reactions does the metal atom show the greatest change in
oxidation state?
(A) MnO₄⁻ to Mn²⁺
(B) MnO₂ to Mn(OH)₃
(C) PbO₂ to PbSO₄
(D) VO₂⁺ to VO²⁺

Solution

2) Chromate and dichromate ions form an equilibrium according to the following equation.

Which solution would increase the concentration of the chromate ion (CrO₄^-2) when added to the equilibrium mixture?
(A) Sodium nitrate
(B) Sodium chloride
(C) Sodium acetate
(D) Ammonium chloride

Solution