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WAEC Biology 2007 Question 30

Question 30

Food Substances and Enzymes

The colour that is associated with a positive iodine test is

  1. A.brown
  2. B.red
  3. C.blue-black
  4. D.yellow
Show the answer and explanation

Answer: C (blue-black)

Explanation

Iodine solution turns blue-black when starch is present.