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Question
Iodine turns blue-black on reacting with ______.
Fill in the Blanks
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Solution
Iodine turns blue-black on reacting with starch.
Explanation:
Iodine acts as a chemical indicator that detects the presence of starch. When iodine solution is added to a substance containing starch, the iodine molecules become trapped within the helical structure of the starch polymer, causing a distinct colour change to blue-black.
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Chapter 1: Life Processes - Exercise 1 [Page 34]
