Question

why the reaction between magnesium dioxide and hydrochloric acid is Redox reaction?

Answer 1

MnO2 + HCl gives MnCl2 + H2O

here, there is reduction in MnO2 and MnCl2(because electronegative element(oxygen) is getting reduced)

also there is oxidation in HCl and H2O (because electronegative element(clorine) is getting oxidised)

Answer 2

MnO2 + 4HCl -----------> MnCl2 + Cl2 + H2O

The oxidation state of Cl in HCL is -1 and it changes to 0 in the product Cl2. Increase in oxidation number occurs, so Cl- is oxidized.

In MnO2, Mn is +4 state and this becomes +2 in product MnCl2. So decrease of oxidation number occurs, hence Mn is reduced.

Hence, MnO2 is the oxidizing agent and HCl is the reducing agent.

Hope it helps :)

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