Question

The substance that is oxidised in the following chemical reaction is
MnO2 + 4 HCl = MnCl2 + 2 H2O + Cl2

Answer 1

Hydrogen is oxidised and Mn is reduced

Answer 2

The substance getting oxidized is chlorine.

Explanation:

Oxidation reaction is defined as the reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

$X\rightarrow X^{n+}+ne^-$

Reduction reaction is defined as the reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

For the given chemical reaction:

$MnO_2+4HCl\rightarrow McCl_2+2H_2O+Cl_2$

The half chemical equation for the above reaction follows:

Oxidation half reaction:  $2Cl^-\rightarrow Cl_2+2e^-$    ( × 5)

Reduction half reaction:  $Mn^{7+}+5e^-\rightarrow Mn^{2+}$       ( × 2)

The substance that is getting oxidized is chlorine and the substance getting reduced is manganese.

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