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?

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iii) and (iv)

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?

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iii) and (iv)

Accepted Answer

Soln:
The answer is (b) (i) and (iii)
Explanation:
Mashed potato and bread are rich in starch. On adding iodine, it reacts with starch to give a blue-black colour.

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