Question:

Which reaction is NOT a redox reaction?

Updated On: Mar 26, 2025
  • Zn+CuSO4→ ZnSO4 + Cu
  • 2KCIO3+l2 → 2KIO3 + Cl2
  • H2+Cl2 → 2HCI
  • BaCl2 + Na2SO4 → BaSO4 + 2NaCl
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The Correct Option is D

Solution and Explanation

Which reaction is NOT a redox reaction?

Option 4: BaCl2 + Na2SO4 → BaSO4 + 2NaCl

Explanation:

A redox reaction involves a change in oxidation states of the reacting species. Let's analyze each option:

Option 1: Zn + CuSO4 → ZnSO4 + Cu

Zn (0) → Zn2+ (oxidation)

Cu2+ → Cu (0) (reduction)

This is a redox reaction.

Option 2: 2KClO3 + I2 → 2KIO3 + Cl2

Cl+5 → Cl2 (0) (reduction)

I2 (0) → I+5 (oxidation)

This is a redox reaction.

Option 3: H2 + Cl2 → 2HCl

H2 (0) → H+1 (oxidation)

Cl2 (0) → Cl-1 (reduction)

This is a redox reaction.

Option 4: BaCl2 + Na2SO4 → BaSO4 + 2NaCl

This is a double displacement reaction. The oxidation states of all the elements remain unchanged:

Ba2+, Cl-, Na+, SO42- remain the same on both sides of the equation.

Therefore, this is not a redox reaction.

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