Question

MnO₂​+4HCl→MnCl₂​+Cl₂​+2H₂​O is a redox reaction. Reason (r): MnO₂​ oxidizes HCl to Cl₂​ and gets reduced to MnCl₂​.

a) Both (a) and (r) are true, and (r) is the correct explanation of (a).
b) Both (a) and (r) are true, but (r) is not the correct explanation of (a).
c) (a) is true, but (r) is false.
d) (a) is false, but (r) is true.

Answer 1

The MnO₂​+4HCl→MnCl₂​+Cl₂​+2H₂​O reaction is a redox reaction where MnO₂ oxidizes HCl, with Mn being reduced and Cl being oxidized.

Step-by-step explanation:

The chemical reaction MnO₂​+4HCl→MnCl₂​+Cl₂​+2H₂​O is indeed a redox reaction. The reason provided is that MnO₂ oxidizes HCl to Cl₂ and itself gets reduced to MnCl₂. This is a typical redox process where both oxidation and reduction occur simultaneously as part of the same reaction. In this process, manganese (Mn) in MnO₂ is reduced as it gains electrons (going from an oxidation state of +4 to +2), while chlorine (Cl) in HCl is oxidized as it loses electrons (going from -1 in HCl to 0 in Cl₂).

Several other examples of redox reactions involve transfer of electrons with changes in oxidation states, like the combination of sodium and chlorine to form sodium chloride or the reaction between manganese dioxide and iron ions in acidic solution. Regardless of the complexity, balancing of redox reactions involves identifying the oxidation and reduction components and ensuring that the number of electrons lost in oxidation equals those gained in reduction.