Starch changes colour and turns blue-black in ............ solution.

Salt

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Eosin

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Iodine

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Dilute HCl

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Solution

The correct option is B Iodine
Iodine present in the aqueous Potassium iodide solution gets entangled in the starch and forms starch Iodide complex. Hence starch turns blue-black or purple-black in colour.
So, the correct answer is option C.

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