Question

Write balanced equation of copper sulphate on treatment with potassium iodide precipitate cu i2 liberates iodine gas and also forms potassium sulphate

Answer 1

                2 CuSO₄ + 4 KI ---------> 2 CuI + I₂ + 2 K₂SO₄

Actually a precipitate of Cul₂ is formed first; but eventually gets converted into Cul and I₂ due to its(Cul₂) unstable nature.