Enter a molecular equation for the gas-evolution reaction that occurs when aqueous hydroiodic acid and aqueous potassium sulfite are mixed.

2HI + K2SO3=>2KI+H2SO3

Explanation:When aqueous hydroiodic acid and aqueous potassium sulfite are mixed the products obtained are potassium iodide and sulfurous acid. Both reactants are ionic compounds and they undergo double replacement reaction. In a double replacement reaction the parts of the ionic compounds are changed. The product is obtained by combinig cation of one compound with anion of other compound. so in above reaction sulfurous acid is obtained which is in gaseous form and potassium iodide is an ionic compound.