Chemistry - Complete Pblock- Question with Solution | TestHub

When KCl, MnO₂, and conc. H₂SO₄ are heated, chlorine gas (Cl₂) is produced. This is a redox reaction where Cl⁻ is oxidized to Cl₂ and MnO₂ is reduced. The resulting mixture contains Mn²⁺ ions, which can form a precipitate with excess KOH.

The reaction is:

$$2\mathrm{KCl}+3{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{MnO}}_2⟶2{\mathrm{KHSO}}_4+{\mathrm{MnSO}}_4+{\mathrm{Cl}}_2+2{\mathrm{H}}_2\mathrm{O}$$

A. Cl₂ is produced. (Correct)

B. It is a redox change. (Correct)

D. MnSO₄ is formed. Mn²⁺ reacts with excess KOH to form Mn(OH)₂ precipitate. (Correct)