In the reaction → MNO2 + 4 HCL → MnCl2 + 2 H2O + Cl2 (a) name the compound (i) oxidised (ii) reduced (b) define oxidation of reduction on its basis.

In the given equation:

MnO₂ + 4HCl →MnCl₂ + 2H₂O + Cl₂

(i) is oxidised to and (ii) is reduced to .

Oxidation: it is either the removal of hydrogen atom or addition of oxygen atom.

Reduction: it is either the removal of oxygen atom or addition of hydrogen atom.

In this hydrogen is removed from , so it is oxidised and oxygen is removed from , so it is reduced