Q. Which of the following is a redox reaction?

निम्नलिखित में से कौन सी रेडॉक्स प्रतिक्रिया है?

A
NaCl + AgNO₃ → NaNO₃ + AgCl
B
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
C
CaCO₃ → CaO + CO₂
D
Zn + CuSO₄ → ZnSO₄ + Cu

Explanation

A redox reaction involves change in oxidation states.

Analyzing each option:

  1. NaCl + AgNO₃ → NaNO₃ + AgCl - Precipitation reaction (no oxidation state change)
  2. H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O - Acid-base neutralization (no oxidation state change)
  3. CaCO₃ → CaO + CO₂ - Decomposition reaction (no oxidation state change)
  4. Zn + CuSO₄ → ZnSO₄ + Cu - Redox reaction ✓
    • Zn: 0 → +2 (oxidation)
    • Cu: +2 → 0 (reduction)

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