Redox reaction products from MnO₂ and HCl

Steps:

• MnO₂ is the oxidizing agent with Mn in +4 state, reducing to +2 in Mn²⁺.
• Concentrated HCl provides Cl⁻ ions, oxidized from -1 to 0 in Cl₂ gas.
• The reaction follows: MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O.
• Products are Mn²⁺ (from MnCl₂) and Cl₂.

Why B is correct:

• Matches the balanced equation where Mn reduces to Mn²⁺ and Cl⁻ oxidizes to Cl₂.

Why the others are wrong:

• A: Cl⁻ is reactant, not product; no oxidation occurs to form it as a new species.
• C: Mn⁴⁺ unchanged, violating reduction; Cl⁻ not oxidized.
• D: Mn⁴⁺ unchanged, violating reduction despite correct Cl₂.

Final answer: B