A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

(A) complex proteins

(B) simple proteins

(C) fats

(D) starch



  • Iodine is used to test the presence of starch .
  • Since rice is a rich source of starch , when iodide solution is added to it, it turns blue-black.

Iodine test for presence of starch in rice solution-01.jpg

So, the correct answer is (d) 

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo