Question

How can we know beforehand that free chlorine will form in MnO2+4HCl -> MnCl2 +Cl2+2H2O?

Answer 1

Heyaa☺

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In the reaction

MnO2 + 4HCl =》 MnCl2 + Cl2 + 2H2O.

We can know that before hand the free chlorine will form by the mass of conservation of mass.

The valency of an element should satify and combine a compound and ions present in the elements.

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Hope you understand...✌