Briefl discribe how to define redox reaction and non-redox reactions. You should use the following reactions as example.
Reaction 1:Na2CO3¯ + 2 HCl → 2 NaCl + CO2 + H2O
Reaction 2:MnO4¯ + 8 H+ + 5 Fe2+ → Mn2+ + 4 H2O + 5 Fe3+