Question

Which reaction is NOT a redox reaction?

• A. Zn+CuSO₄→ ZnSO₄ + Cu
• B. 2KCIO₃+l₂ → 2KIO₃ + Cl₂
• C. H₂+Cl₂ → 2HCI
• D. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

Answer 1

The Correct Option is D

To identify the reaction that is not a redox reaction, we must define a redox reaction. A redox reaction involves the transfer of electrons between chemical species, resulting in altered oxidation states. We will examine each reaction to ascertain changes in oxidation states:

Zn + CuSO₄ → ZnSO₄ + Cu

Zinc (Zn) transitions from an oxidation state of 0 to +2, indicating oxidation. Copper (Cu) transitions from +2 to 0, indicating reduction. This reaction is a redox reaction.

2KClO₃ + I₂ → 2KIO₃ + Cl₂

Chlorine undergoes reduction, changing from an oxidation state of +5 in KClO₃ to 0 in Cl₂. Iodine undergoes oxidation, changing from 0 to +5 in KIO₃. This reaction is a redox reaction.

H₂ + Cl₂ → 2HCl

Hydrogen's oxidation state changes from 0 to +1. Chlorine's oxidation state changes from 0 to -1. This reaction is a redox reaction.

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

The oxidation states of barium, sodium, and chloride remain unchanged on both sides of the equation. This is a double displacement reaction, not a redox reaction.

The reaction: BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl is NOT a redox reaction.