Which of the following equations represent
redox reactions? For each redox reaction,
determine which atom is oxidized and which
is reduced, and identify the oxidizing agent
and the reducing agent.
a. MgO(s) + H2CO3(aq) →
MgCO3(s) + H2O(l)
b.2KNO3(s)→2KNO2 (s) + O2(8)
c. H2(g) + CuO(s) → Cu(s) + H2O(1)
d. NaOH(aq) + HCl(aq) →
NaCl(aq) + H2O(1)
e. H2(8) + Cl2(g) → 2HCl(8)
f. SO3(g) + H2O(1)→ H2SO4(aq)

a. MgO(s) + H2CO3(aq) →  MgCO3(s) + H2O(l) DOUBLE DISPLACEMENT REACTION.

b. 2KNO3(s)→2KNO2 (s) + O2(8) DESCOMPOSITION REACTION.

c. H2(g) + CuO(s) → Cu(s) + H2O(1) SINGLE DISPLACEMENT REACTION.

d. NaOH(aq) + HCl(aq) →  NaCl(aq) + H2O(1) COMBUSTION  REACTION.

e. H2(8) + Cl2(g) → 2HCl(8) SYNTHESIS REACTION.

f. SO3(g) + H2O(1)→ H2SO4(aq) SYNTHESIS REACTION.

a:

by the combination of an unlimited number of elements