*निम्नलिखित में से कौन एक रेडॉक्स अभिक्रिया है?* 1️⃣ H₂ + Cl₂ → 2HCl 2️⃣ CaCO₃ → CaO + Co₂ 3️⃣ NaOH + HCl → NaCl + H₂O 4️⃣ AgNO₃ + HCl → AgCl + HNO₃
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