A potassium iodide (KI) solution containing starch turns blue on the addition of chlorine. Which one of the following statements explain this? (P) The reduction potential of Cl₂ is more than that of 12. (Q) The oxidation potential of Cl₂ is more than that of 12. (R) The product formed when Cl₂ combines with starch is blue. (S) The product formed when 12 combines with starch is blue. (a) Only P and R (b) Only Q and R (c) Only Q and S (d) Only P and S
