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Which of the following gives a blue colour with iodine?

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Chalk powder

Sago powder

Common salt

Powdered sugar

answer is A.

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Detailed Solution

Starch is a type of carbohydrate found in plants and their products. Sago powder is a plant product rich in starch.

When a solution of iodine and potassium iodide is added to the starch-containing sago powder, the substance turns deep blue. This is because the starch combines with iodine to give a characteristic blue colour.

Sugar is rich in glucose, common salt is sodium chloride and chalk powder is calcium carbonate.

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