Which of the following reactions is NOT an example of redox reaction?

Step-by-step solution

A redox reaction involves a change in the oxidation states of the elements involved. In the reaction Cl ₂ + 2 H ₂ O + SO ₂ 4 H ^+ + SO ₄²⁻ + 2 Cl ^- , the oxidation state of Cl changes from 0 to -1 and S changes from +4 to +6 . This is a redox reaction. In the reaction Cu ²⁺ + Zn Cu + Zn ²⁺ , the oxidation state of Cu changes from +2 to 0 and Zn changes from 0 to +2 . This is a redox reaction. In the reaction 2 H ₂ + O ₂ 2 H ₂ O , the oxidation state of H changes from 0 to +1 and O changes from 0 to -2 . This is a