Question

Potato tuber wash and iodine solution placed together change their colour to

• A. Blue-black
• B. Blue
• C. Brick-red
• D. Magenta

Answer 1

The correct option is A

Blue-black

The correct option is D.

Explanation of correct option:

1. Potassium iodide and iodine solution in water are known as iodine solutions.
2. The presence of starch can be determined using an iodine test.
3. When a few drops of iodine solution are put onto starch-containing materials like potato slices, the solution turns dark blue.
4. Because it reacts with the starch in the potato slice, it gives it a blue-black color.
5. This shows that the potato has starch.

Final Answer: Potato tuber wash and iodine solution are placed together to change their colour to Blue-black.