Question

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3.
When you added tincture iodine to starch, you observed 1
A) Blue black B) Yellow blue
C) Black red D) Blue red ​

Answer 1

Explanation:

a)blue black is the answer

Answer 2

The observation will be -

A) Blue black

Starch is the carbohydrate molecule.

Iodine is yellow coloured solution, which is commonly used to check for the presence of starch.

Iodine reacts with starch to form starch iodide complex, which is blue black in color. The reaction occurs between triiodide anions and starch, where triiodide ions get trapped in starch molecules.

Common test can be done on potato, a rich source of starch.