Question

An indicator ‘X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with H₂O₂ at room temp. The indicator ‘X’ forms blue colored complex with compound ‘A’ present in the solution. The indicator ‘X’ and compound ‘A’ respectively are 

(1) Starch and iodine 

(2) Methyl orange and H₂O₂ 

(3) Starch and H₂O₂ 

(4) Methyl orange and iodine

Answer 1

(1) Starch and iodine