Question

While using iodine in the laboratory, some drops of iodine fell on Paheli‟s socks and some fell on her teacher‟s saree. The drops of iodine on the saree turned blue black while their colour did not change on the socks. What can be the possible reason?

Answer 1

Saree is made up of cotton. So naturally it contains starch. So when iodine reacts with starch it changes it's colour to black blue.
On the other hand socks are made of artificial fibres like rayon which don't react with iodine. So it colour doesn't change

Answer 2

Answer:

The teacher might have put starch to make the saree stiff and neat

Explanation:

so the iodine reacts to the starch and becomes blue black