The color of the iodine solution turns blue-black when it is added to a slice of bread. This indicates that the bread is rich in:

proteins

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carbohydrates

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fats

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calcium

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Solution

The correct option is B carbohydrates
Iodine is a common indicator to test for the presence of starch. The light orange-brown colour Iodine solution turns blue-black in colour when it reacts with starch. This indicates the presence of carbohydrates in the food item to which iodine solution was added. Food items like bread, chapati etc. are rich in carbohydrates.

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Question 8
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

(a) complex proteins
(b) simple proteins
(c) fats
(d) starch

When iodine is added to starch solution, the solution turns ___ in colour.

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