Problem: Which of the following reactions is an oxidation-reduction reaction? 1. HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l) 2. Ca (s) + HCl (aq) → CaCl 2 (aq) + H2 (g) 3. 3 Na2S (aq) + 2 FeCl 3 (aq) → Fe2S3 (s) + 6 NaCl (aq) 4. CO2 (g) + 2 LiOH (aq) → Li 2CO3 (s) + H2O (l)

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Which of the following reactions is an oxidation-reduction reaction?

1. HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l)

2. Ca (s) + HCl (aq) → CaCl 2 (aq) + H2 (g)

3. 3 Na2S (aq) + 2 FeCl 3 (aq) → Fe2S3 (s) + 6 NaCl (aq)

4. CO2 (g) + 2 LiOH (aq) → Li 2CO3 (s) + H2O (l)

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