Question

Assertion : MnO2 + 4 HCl MnCl2 + Cl2 + 2H2O is a redox reaction. Reason : MnO2 oxides HCl to Cl2 and gets reduced to MnCl2

Answer 1

Answer:

Assertion is true but Reason is false.

Explanation:

• A redox reaction is a reaction which involves both oxidation and reduction simultaneously.
• The electrons lost in the process of oxidation of one half of the reaction is taken up by the reactant which gets reduced. Hence the number of electrons lost and gained in a balanced redox reaction are equal.
• In this given reaction the Cl(-) in HCl is oxidized to Cl2 while the Mn(+4) in MnO2 is reduced to Mn(2+) in MnCl2.

Answer 2

Both the Assertion and the reason are correct and the reason is the correct explanation of the assertion.

Explanation

REDOX REACTIONS -

• The chemical reaction in which reactants undergo reduction and oxidation simultaneously with the change in oxidation state.
• The reactant that is reduced is known as a reducing agent and the other that is oxidized is known as an oxidizing agent.
• The given reaction is a redox reaction,

                    $MnO_2 + 4HCl$ → $MnCl_2 + Cl_2 + 2H_2O$

• In the reaction, manganese oxide is the oxidizing agent as it oxidizes hydrochloric acid to chlorine gas.
• Hydrochloric acid is the reducing agent as it reduces manganese oxide to manganese chloride.
• HCl is losing hydrogen to form chloric gas whereas manganese oxide is losing oxygen to form manganese chloride.