JEE Main 202329 Jan, Evening shiftChemistryEasyd- and f-Block Elements158× since 2002
An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with at room temp. The indicator 'X' forms blue coloured complex with compound 'A' present in the solution. The indicator 'X' and compound 'A' respectively are :