Which of the following equations is a redox reaction?

CHEMISTRY · Single correct · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

Which of the following equations is a redox reaction? (1) MgO(s)+2HCl(aq)→MgCl2(aq)+H2O(l)\text{MgO}(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{MgCl}_2(\text{aq}) + \text{H}_2\text{O}(\text{l}) (2) HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)\text{HCl}(\text{aq}) + \text{NaOH}(\text{aq}) \rightarrow \text{NaCl}(\text{aq}) + \text{H}_2\text{O}(\text{l}) (3) 2NaOH(aq)+Cl2(g)→NaOCl(aq)+NaCl(aq)+H2O(l)2\text{NaOH}(\text{aq}) + \text{Cl}_2(\text{g}) \rightarrow \text{NaOCl}(\text{aq}) + \text{NaCl}(\text{aq}) + \text{H}_2\text{O}(\text{l}) (4) MgCO3(s)→MgO(s)+CO2(g)\text{MgCO}_3(\text{s}) \rightarrow \text{MgO}(\text{s}) + \text{CO}_2(\text{g})

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