Potassium nitrate was calcined. The solid product of the reaction was heated with ammonium iodide, while the gas, which is part of the air, was released, and salt was formed. The salt was treated with hydrogen peroxide. The resulting simple substance reacted by heating with sodium hydroxide solution. Write the equations for the four reactions described.
2KNO3 -> 2KNO2 + O2
KNO2 + NH4I -> N2↑ + KI + 2H2O
2KI + H2O2 = I2 + 2KOH
3I2 + 6NaOH -> 5NaI + NaIO3 + 3H2O
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