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Q.

Which colour indicates the presence starch while using dilute iodine solution to test a food sample for the presence of starch?

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a

Blue-black colour

b

Blue-green colour

c

Yellow colour

d

Red colour

answer is B.

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Detailed Solution

detailed_solution_thumbnail

We can test the presence of starch in the given food sample.
This can be done by putting 2-3 drops of dilute iodine solution on the food sample.
If the food sample turns blue-black in colour, it confirms the presence of starch in the food sample.

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