Multiple choice

What will be the colour of iodine changed if starch is present?

  1. Blue-black to brown

  2. Yellowish brown to blue-black

  3. Navy blue to yellowish brown

  4. Yellow to black
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iodine solution is naturally a yellowish-brown color. When it comes into contact with starch, a chemical reaction occurs that changes its color to a deep blue-black. This color change is a standard positive test for the presence of starch.

Keep practicing — related questions