Question

\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

The reaction given above is a redox reaction because in this case ______.

Options

• \[\ce{MnO2}\] is oxidised and \[\ce{HCl}\] is reduced.

• \[\ce{HCl}\] is oxidised.

• \[\ce{MnO2}\] is reduced.

• \[\ce{MnO2}\] is reduced and \[\ce{HCl}\] is oxidised.

Answer 1

\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

The reaction given above is a redox reaction because in this case MnO₂ is reduced and HCl is oxidised.

Explanation:

In \[\ce{MnO2}\], manganese (\[\ce{Mn}\]) oxidizes from +4 to +2 in \[\ce{MnCl₂}\]. This suggests that manganese has been lowered. In \[\ce{HCl}\], chlorine (\[\ce{Cl}\]) transitions from an oxidation state of -1 to 0 in \[\ce{Cl2}\]. This signifies that chlorine is oxidized.