Which of the following is redox reaction

Options

(a) 2CuSO₄ + 4KI → Cu₂I₂ + 2K₂SO₄ + I₂
(b) SO₂ + H₂O → H₂SO₃
(c) Na₂SO₄ + BaCl₂ → [Cu(NH₃)₄]SO₄
(d) CuSO₄ + 4NH₃ → [Cu(NH₃)₄ ]SO₄

Correct Answer:

2CuSO₄ + 4KI → Cu₂I₂ + 2K₂SO₄ + I₂

Explanation:

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