Titration of KI with H2O2 in presence of acid is a:

The reaction involves :H2O2+2I−+2H+⟶I2+2H2O(l)2Na2S2O3+I2⟶Na2S4O6+2NaIThe reaction gives blue colour only after all the Na2S2O3 is used. The reaction is carried out with adjusted amount of Na2S2O3 so that only a fraction of H2O2 and KI reaction occurs before the blue colour of starch-l2 appears, however the slow redox reaction of H2O z-lzcontinues. The appearance of blue colour is like clock alarm and in such reactions time for.the appearance of blue colour is noticed. The phenomenon is used in studying rate of reaction. If time taken fbr blue.colour appearance is longer, the reaction is slow and vice - versa.

Titration of KI with H2O2 in presence of acid is a:

The reaction involves :H2O2+2I−+2H+⟶I2+2H2O(l)2Na2S2O3+I2⟶Na2S4O6+2NaIThe reaction gives blue colour only after all the Na2S2O3 is used. The reaction is carried out with adjusted amount of Na2S2O3 so that only a fraction of H2O2 and KI reaction occurs before the blue colour of starch-l2 appears, however the slow redox reaction of H2O z-lzcontinues. The appearance of blue colour is like clock alarm and in such reactions time for.the appearance of blue colour is noticed. The phenomenon is used in studying rate of reaction. If time taken fbr blue.colour appearance is longer, the reaction is slow and vice - versa.

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Titration of KI with H₂O₂ in presence of acid is a:

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clock reaction

redox reaction

intermolecular redox

all of these

answer is D.

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Detailed Solution

The reaction involves :
$\begin{array}{l} H_{2} O_{2} + 2 I^{-} + 2 H^{+} ⟶ I_{2} + 2 H_{2} O (l) \\ 2 {Na}_{2} S_{2} O_{3} + I_{2} ⟶ {Na}_{2} S_{4} O_{6} + 2 NaI \end{array}$
The reaction gives blue colour only after all the Na₂S₂O₃ is used. The reaction is carried out with adjusted amount of Na₂S₂O₃ so that only a fraction of H₂O₂ and KI reaction occurs before the blue colour of starch-l₂ appears, however the slow redox reaction of H₂O z-lzcontinues. The appearance of blue colour is like clock alarm and in such reactions time for.the appearance of blue colour is noticed. The phenomenon is used in studying rate of reaction. If time taken fbr blue.colour appearance is longer, the reaction is slow and vice - versa.