The intensity of light can affect the rate of reaction between potassium iodide KI and hydrogen peroxide H2O2 through the process of photolysis. Photolysis is the process by which a chemical compound is broken down into smaller molecules or atoms due to the absorption of light.In the reaction between KI and H2O2, the presence of light can lead to the formation of free iodine I2 and hydroxide ions OH- through the photolysis of hydrogen peroxide:H2O2 + light 2 OHThe hydroxide radicals OH are highly reactive and can react with iodide ions I- from the potassium iodide:OH + I- OH- + IThe iodine radicals I can then react with other iodide ions to form iodine molecules I2 :I + I- I2The overall reaction in the presence of light can be represented as:2 KI + H2O2 + light 2 K+ + 2 I2 + 2 H2OThe rate of this reaction depends on the intensity of light. As the intensity of light increases, the rate of photolysis of hydrogen peroxide also increases, leading to a higher concentration of hydroxide radicals and iodine radicals. This, in turn, increases the rate of reaction between KI and H2O2.In summary, the intensity of light affects the rate of reaction between potassium iodide and hydrogen peroxide by increasing the formation of reactive intermediates OH and I through photolysis. As the light intensity increases, the rate of reaction also increases.