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 determine which reaction is NOT a redox reaction, we must understand what constitutes a redox reaction. In a redox (reduction-oxidation) reaction, there is a transfer of electrons between species, leading to changes in their oxidation states. We'll analyze each option to check the oxidation state changes:

Zn + CuSO₄ → ZnSO₄ + Cu

Zinc (Zn) is oxidized from 0 to +2 and copper (Cu) is reduced from +2 to 0. This is a redox reaction.

2KClO₃ + I₂ → 2KIO₃ + Cl₂

Chlorine changes from +5 in KClO₃ to 0 in Cl₂ (reduction), and iodine changes from 0 to +5 in KIO₃ (oxidation). This is a redox reaction.

H₂ + Cl₂ → 2HCl

Hydrogen changes from 0 to +1, and chlorine changes from 0 to -1. This is a redox reaction.

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

No change in oxidation states for barium, sodium, or chloride as both sides have the same oxidation numbers. This is a double displacement reaction, not a redox reaction.

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