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

Answers (1)

Ans.(d)
Starch solution on addition of iodine turns blue-black in colour and this test is used as conformation test for iodine.
The iodine–starch test is a chemical reaction that is used to test for the presence of starch or for iodine. The combination of starch and iodine is intensely blue-black.

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