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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour.

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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:

A. complex proteins 

B. simple proteins 

C. fats 

D. starch

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Iodine is the test for starch. If starch is present, iodine turns blue-black in colour. So, if the solution turned blue black in colour when iodine was added to rice water, it indicates that rice water had starch present in it.

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