Identify the element oxidized, theelement reduced, the oxidizing agent and the reducing agent in each unbalanced redox equation.
a) MnO2(s) + HCl(aq) ---->MnCl2(aq) + Cl2(g) +H2O(l)
b) Cu(s) + HNO3(aq)------>Cu(NO3)2(aq) +NO2(g) + H2O(l)
c) P(s) + HNO3(aq) + H2O(l)------> NO(g) + H3PO4(aq)
d) Bi(OH)3(s) + Na2SnO2(aq)-------> Bi(s) +Na2SnO3(aq) +H2O(l)