MCQ
Given below from $(i)$ to $(iv)$ are some food items.
$i.$ Boiled and mashed potato.
$ii.$ Glucose solution.
$iii.$ A slice of bread.
$iv.$ Mustard oil.
Which of the above will give blue$-$black colour when tested with iodine?
  • A
    $(i)$ and $(ii)$
  • $(i)$ and $(iii)$
  • C
    $(ii)$ and $(iii)$
  • D
    $(iii)$ and $(iv)$

Answer

Correct option: B.
$(i)$ and $(iii)$
The food containing starch $($carbohydrate$)$ on reaction. with iodine gives blue$-$black colour, $e.g.$ Boiled and mashed potato, a slice of bread.
Glucose solution and mustard oil would not give blue$-$black colour as they are not starch. Mustard oil is fat and glucose is simple unit of carbohydrate.

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