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 temperature. The indicator ‘X’ forms blue-colored complex with compound ‘A’ present in the solution. The indicator

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Solution

Q.
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 temperature. The indicator ‘X’ forms blue-colored complex with compound ‘A’ present in the solution. The indicator ‘X’ and compound ‘A’ respectively are [2023]

1 Starch and iodine

2 Methyl orange and $H_{2} O_{2}$

3 Methyl orange and iodine

4 Starch and $H_{2} O_{2}$

Ans.
(1)

$2 {Na}_{2} S_{2} O_{3} + I_{2} \overset{Starch}{\to} 2 NaI + {Na}_{2} S_{4} O_{6}$

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