Write a balanced equation for the reaction which takes place when a mixture of concentrated hydrochloric acid and solid manganese(IV) oxide is heated.

Here's the solution to the exercise:

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1. (a) Write a balanced equation for the reaction which takes place when a mixture of concentrated hydrochloric acid and solid manganese(IV) oxide is heated.

$$\text{MnO}_2(s) + 4\text{HCl}(aq) \xrightarrow{\text{heat}} \text{MnCl}_2(aq) + \text{Cl}_2(g) + 2\text{H}_2\text{O}(l)$$

**1. (b) A mixture of 1g of solid manganese(IV) oxide and concentrated hydrochloric acid containing 1g of pure acid is heated in the above reaction