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Q. |
potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? |
A. | From brown to blue-black |
B. | From brown to orange-red |
C. | From blue to pink |
D. | From pink to blue-green |
Answer» A. From brown to blue-black | |
Explanation: The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black colour. |
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