Which of the following is NOT a redox reaction?A) CuSO4 + Fe  FeSO4 + CuB) Na2CO3 + 2 HCl  2 NaCl + CO2 + H2OC) Zn + 2 HCl  ZnCl2 + H2D) Ni + 2 AgNO3  2 Ag + Ni(NO3)2E) 2 NaBr + Cl2  2 NaCl + Br2

The reaction that is NOT a redox reaction is B) Na2CO3 + 2 HCl  2 NaCl + CO2 + H2O.

Here's why:

A redox reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.

For each reaction, we can determine whether it is a redox reaction by checking if there is a change in oxidation state for the elements involved.

A) CuSO4 + Fe  FeSO4 + Cu In this reaction, Cu is reduced from +2 to 0, and Fe is oxidized from 0 to +2. So, it's a redox reaction.

B) Na2CO3 + 2 HCl  2 NaCl + CO2 + H2O In this reaction, there is no change in the oxidation state of any of the elements. So, it's not a redox reaction.

C) Zn + 2 HCl  ZnCl2 + H2 In this reaction, Zn is oxidized from 0 to +2, and H is reduced from +1 to 0. So, it's a redox reaction.

D) Ni + 2 AgNO3  2 Ag + Ni(NO3)2 In this reaction, Ni is oxidized from 0 to +2, and Ag is reduced from +1 to 0. So, it's a redox reaction.

E) 2 NaBr + Cl2  2 NaCl + Br2 In this reaction, Br is oxidized from -1 to 0, and Cl is reduced from 0 to -1. So, it's a redox reaction.