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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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Correct Answer - d
The blue - black colour of rice water confirms the presence of starch.
No colour change will be seen in case of proteins or fats in iodine solution colour , when iodine is added with them.

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