Redox Reactions Question 4
Question 4 - 29 January - Shift 2
An indicator ’ $X$ ’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $H_2 O_2$ 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 $H_2 O_2$
(3) Starch and $H_2 O_2$
(4) Methyl orange and iodine
Show Answer
Answer: (1)
Solution:
Formula: Starch Iodide Test
$ I^{-}+H_2 O_2 \longrightarrow \underset{(A)}{I_2}+H_2 O $
$I_2+\underset{\text{ (Indicator) }}{Starch} \longrightarrow$ Blue
