Question

What is the color of starch solution when react with acid?

Answer 1

Blue colour,,,,,,here is ur answer buddy.
Hope it will help you..

Answer 2

When starch solution is reacted with acid, hydrolysis occurs.

In order to demonstrate this behavior, iodine is mixed with starch solution so that it turns from white to blue-black color.

Then, an acid ( say, hydrochloric acid) is mixed with this starch-iodine solution and heated.

Process of  acid hydrolysis converts starch into glucose. Iodine is separated from its bond.

So, the blue-black color fades out.