Answer :

Step 1 - To balance chemical equations, first list the number of atoms of different type that are present in the chemical equation on both sides –
MnO2 + HCl → MnCl2 + Cl2 + H2O

Step 2 - To start balancing, we take any one compound. We will take HCl on the reactant side in consideration. Let’s start with that. 


Hence the Partially Balanced Equation will be:- MnO2 + 4HCl MnCl2 + Cl2 + 2H20

Step 3 - Now checking for all other elements we note that the numbers of atoms on both sides are same. We can say that the equation is balanced. 

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