Which of the following is used to chemically test starch?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. Iodine solution.
Chemical testing for the presence of starch is often done using the iodine test.
When starch and iodine mix, a blue-black complex is formed. In biology and chemistry laboratories, this test is often used to determine whether starch is present in a variety of substances.
This process involves dipping the sample under test with a few drops of iodine solution.
If starch is present the color turning blue-black, indicating a positive result.
If starch is not present the solution retains its original color.