The role of starch in iodometric titrations is that

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it acts an oxidant

it is reducing agent

it acts as indicator

it is a medium

answer is C.

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Detailed Solution

In iodometric solutions, I₂ solution to be estimated is pippetted out is conical flask to which starch is added as indicator blue colour develops.
Now the standand solution of Na₂S₂O₃ taken in buerette is added slowly to the contents of the conical flask. Na₂S₂O₃reduces I₂ to I^- due to which blue colour disappears

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