Question

Boojho took some grains of boiled rice in a test tube a and paheli took boiled and chewed rice in a test tube b. both of them poured-1-2-drops of iodine solution into the test tube. What colour change would they have observed. Give reasons for your answer.

Answer 1

Starch:

• In chemistry, triiodide-containing redox titrations frequently use starch as an indicator.
• Triiodide and starch combine to create a very dark blue-black complex.
• However, if only iodine or iodide$\left({\mathrm{I}}^{-}\right)$ is present, the complex does not form.

Observation:

• Starch can be found in the boiled rice in test tube A. Iodine is added, and the mixture takes on a blue-black hue when combined. This demonstrates that test tube A contains starch.
• In test-tube B, the digestion of rice starch results in the production of sugar. Iodine's colour won't alter as a result.