19. Given: KMnO4(aq) + 3 NO2(g) + 2 KOH(aq) → MnO2(s) + 3 KNO3(aq) + H2O(l). Which element is oxidized and which element is reduced during the reaction?
manganese is oxidized and nitrogen is reduced

a)nitrogen is oxidized and manganese is reduced
b)manganese is oxidized and oxygen is reduced
c)hydrogen is oxidized and nitrogen is reduced
d)oxygen is oxidized and manganese is reduced

Question

19. Given: KMnO4(aq) + 3 NO2(g) + 2 KOH(aq) → MnO2(s) + 3 KNO3(aq) + H2O(l). Which element is oxidized and which element is reduced during the reaction?
manganese is oxidized and nitrogen is reduced

a)nitrogen is oxidized and manganese is reduced
b)manganese is oxidized and oxygen is reduced
c)hydrogen is oxidized and nitrogen is reduced
d)oxygen is oxidized and manganese is reduced

rogue · Answer

Throughout the reaction, the potassium keeps its charge of +1, so it is a spectator ion. In the reactants, Mn has a charge of +7 and in the products, it has a charge of +4, so it gains electrons and so is reduced. In the reactants, N has a charge of +4, and in the products, its charge becomes +5, so it loses electrons and is oxidized.

A) nitrogen is oxidized and manganese is reduced