Question

Which of the following is an oxidation-reduction reaction? Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2 CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4 2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4

Answer 1

Only 1st one is a redoz reaction

Answer 2

Oxidation can be defined as the addition of oxygen or removal of hydrogen from a chemical compound taking part in a reaction and reduction is just the opposite which is addition of hydrogen or removal of oxygen from it.

In reaction 01; Fe₂CO₃ converts in 2Fe; it is removal of oxygen i.e; reduction.

and 3CO converts in 3CO₂; it is addition of oxygen i.e; oxidation.

Therefore, reaction 01 is a redox reaction.

In case of other reactions mentioned; those are not redox reactions but most of them are double substitution reactions.