Question

Which of the following chemical reactions is not an oxidation-reduction reaction?

CuSO4 + BaCl2 yields BaSO4 + CuCl2

N2 + 3H2 yields 2NH3

Zn + H2SO4 yields ZnSO4 + H2

2Na + Cl 2 yields 2NaCl

Answer 1

the answer to this is A

Answer 2

The chemical reaction

`CuSO_(4) + BaCl_(2) yields BaSO_(4) + Cu Cl_(2)`
is not an oxidation-reduction reaction because there is no trasfer of electrons. The following are the oxidation numbers of the species involved:
Reactants side:
Cu = +2
Sulfate ion = -2
Cl2 = -2
Ba = +2

Products side:
Cu = +2
Sulpahte Ion = -2
Cl2 = -2
Ba = +2