Question

In food, starch is detected by its
(a) granular form
(b) white appearance
(c) energy reserve
(d) blue reaction with iodine

Answer 1

In food, starch is detected by its blue reaction with iodine.

• Option (d) is correct.
• There is a simple experiment to determine if a food contains starch or not.  
• The experiment is known as "the iodine test for starch".
• This experiment makes use of iodine to detect the presence of starch in food.
• The presence of starch in food changes the colour of iodine to dark blue-black colour.

Answer 2

In food, starch is detected by its  blue reaction with iodine.

Option (D) is correct.

Explanation:

• The iodine test is used to test for the presence of starch.
• When aqueous solutions of the tri-iodide anion is added to Starch solution it turns into an intense "blue-black" colour.
• The intense blue black color is due to the formation of an intermolecular charge-transfer complex.
• In the absence of starch, the brown color of the aqueous solution remains the same.

Also learn more

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