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Question

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

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B

simple proteins

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C

fats

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D

starch

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Solution

The correct option is D

starch


The correct option is (D).

Explanation of the correct option:

  1. A solution of iodine and potassium is added to a starch-containing substance instead of molecular iodine because molecular iodine is not soluble in water.
  2. Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue colour of the reaction.
  3. The reaction proceeds as follows:- I2 + I→ I3– + starch (dark blue colour)
  4. In the absence of starch solution, remains as light brown colour which is the colour of iodine solution.

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


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