TS EAMCET 4 May 2018 Shift 1 Solved Paper

The chemical reaction occurs during the titration of I2(aq) with S2O32− by using starch solution is written as,
I3−+2S2O32−→S4O62−+3 I−
Deep blue colour disappears at the end point due to the decomposition of the iodine starch complex, which implies that colour changes from blue to colourless.