What happens when MnO2 is mixed with concentrated HCl and heated?

Explanation

Answer: When MnO2 is mixed with concentrated HCl and heated, HCl oxidizes to greenish-yellow chlorine gas and MnO2 oxidizes to manganese chloride.

MnO2 + 4HCl = MnCl2 + Cl2 ↑ + 2H2O

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