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Indicators

The indicator...

Question

The indicator used in iodometric titrations is

A

Phenolphthalein

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B

Litmus

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C

Potassium iodide

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D

Starch

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Solution

The correct option is D Starch

The indicator that is usually chosen for titrations involving iodine (triiodide) is starch. Starch forms a dark blue complex with iodine. The end point in iodimetry corresponds to a sudden color change to blue.
Hence option D is correct.

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Q. Which indicator we prefer to use in iodometric titration?

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

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