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The reaction is known as the displacement reaction. When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I 2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as: 2KI(aq)+Cl 2(g)→2KCl(aq)+I 2(s)
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