Question : Starch in potatoes reacts with _____, turning to a blue colour.
Option 1: fluorine
Option 2: bromine
Option 3: iodine
Option 4: chlorine
Correct Answer: iodine
Solution : The correct option is iodine .
The starch in potatoes reacts with iodine, turning to a blue-black colour. This reaction is commonly used in science experiments and is known as the iodine test for starch. When iodine comes in contact with starch, it forms a complex that exhibits this distinctive blue-black colour, providing a visual indicator of the presence of starch.
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