Assertion :Starch is used as absorption indicator in iodometric and iodimetric titrations. Reason: Starch forms iodostarch complex with iodine, which is blue coloured.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

In the Iodometry, this is based on the oxidation of iodide into iodine. Iodometry is used for determine the amount of oxidizing agents. The amount of oxidizing agent is determined by titration of iodine with thio sulfate. Starch is used as indicator. The end point detection is based on the formation of blue starch complex. Starch is used as absorption indicator in iodometric and iodimetric titrations and starch forms iodostarch complex with iodine, which is blue coloured.

So both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Hence option A is correct.

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