Name the gas evolved when an oxide and concentrated hydrochloric acid are heated.

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Solution

When an oxide and concentrated hydrochloric acid are together heated, chlorine gas is liberated.
For example, when manganese dioxide is heated with hydrochloric acid, manganese chloride is formed with the liberation of chlorine gas.

MnO₂ (s) + 4HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g)
Manganese Manganese
dioxide chloride

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