Question

Match the reactants in List $1$ with the indicator in List $2$.

Answer 1

(A) During the tiration $F{e}^{2+}/{C{r}_2{O}_7}^{2-}$, the indicator used is $K_3\left[Fe\right(CN{)}_6]4$.
(B) During the titration $AgN{O}_3/CN{S}^{-}$, ferric alum indicator is used.
(C) During the titration $CuS{O}_4/KI/{S_2{O}_3}^{2-}$, starch is used as indicator. Iodine forms blue colour complex with starch. The end point is the disappearance of blue colour.
(D) During the titration $F{e}^{2+}/{Mn{O}_4}^{-},{Mn{O}_4}^{-}$ acts as self indicator as it has intense purple colour. The end point is colourless to pink.