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Question
Given below from (i) to (iv) are some food items.
- Boiled and mashed potato
- Glucose solution
- A slice of bread
- Mustard oil
Which of the above will give a blue-black colour when tested with iodine?
Options
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(iii) and (iv)
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Solution
(i) and (iii)
Explanation:
When iodine is added to starch, it turns blue-black in colour. Potato and bread are rich in starch. Therefore, boiled and mashed potato and a slice of bread turn blue-black in colour when tested with iodine. Glucose solution does not change colour because it is a digestive product of starch.
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