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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 H2O2 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

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a

Methyl orange and H2O2

b

Methyl orange and iodine

c

Starch and iodine

d

Starch and H2O2

answer is A.

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Detailed Solution

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Iodide ion is oxidized to I2 Which gives blue color with starch indicator

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