Iodine is a yellowish solution. a starch solution is white. a starch solution turns purplish-black in the presence of iodine. if you wait a few hours, then add iodine to the beaker, what color would the beaker solution be?

The correct answer will be- the color change will be observed and the solution will turn purplish-black.

Explanation:

Iodine test is performed to test the presence of the carbohydrates mainly starch.

The iodine solution is chemically called potassium iodide which forms a yellow solution. The potassium iodide solution forms a complex with a starch solution which appears a purplish-black color which shows the presence of the carbohydrates.

In the given question, if we add the iodine solution to the beaker after a certain point of time then it will still form a complex with the starch and thus beaker solution will appear darker in color.

the answer is c.) there is a warm front in region a and a stationary front in region b.