NEET BIOLOGY

Detailed explanation-1: -Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I2) and potassium iodide (KI) in water has a light orange-brown color. If it is added to a sample that contains starch, such as the bread pictured above, the color changes to a deep blue.

Detailed explanation-2: -Lugol’s iodine solution is a starch indicator, chemical reagent, and biological stain. This chemical stains carbohydrates in plant and animal specimens brown or blue-black and stains glycogen red. This 30 ml bottle is an aqueous solution of 1.8% iodine and 3.0% potassium iodide. This iodine solution is water-based.

Detailed explanation-3: -Lugol’s iodine test is a commonly used diagnostic tool when colposcopically assessing the cervix in order to identify cervical dysplasia [10, 13, 22].

Detailed explanation-4: -You can use an iodine solution to detect the presence of complex carbohydrates. The yellow-orange iodine will turn blue-black as it reacts with starch. (The iodine solution will show no reaction with simple carbohydrates or sugars.)

Detailed explanation-5: -Iodine Test: When following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. Soluble starch solution is added. Only iodine element in the presence of iodide ion will give the characteristic blue black color.