Starch in potatoes reacts with _____, turning to a blue colour.

Iodine

The correct answer is Option (3)- Iodine

Starch in potatoes reacts with Iodine, turning to a blue color.

Iodine Test for Starch:

• The iodine test is commonly used to detect the presence of starch in various substances.
• When iodine comes into contact with starch, it forms a complex that results in a distinctive blue-black color.
• This reaction is widely used in biology and chemistry laboratories to identify the presence of starch in materials, including food items like potatoes.