Question : Starch in potatoes reacts with _____, turning to a blue colour.
Option 1: fluorine
Option 2: bromine
Option 3: iodine
Option 4: chlorine
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Correct Answer: iodine
Solution : The correct option is iodine.
The starch in potatoes reacts with iodine, turning to a blue-black colour. This reaction is commonly used in science experiments and is known as the iodine test for starch. When iodine comes in contact with starch, it forms a complex that exhibits this distinctive blue-black colour, providing a visual indicator of the presence of starch.
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Question : Which among the following elements does not belong to the Halogens group?
Option 1: Astatine
Option 2: Helium
Option 3: Bromine
Option 4: Chlorine
Question : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
Option 1: From brown to blue-black
Option 2: From brown to orange-red
Option 3: From blue to pink
Option 4: From pink to blue-green
Question : In a bucket, there are 40 red balls and 120 blue balls. The ratio of red to blue is:
Option 1: 1 : 3
Option 2: 3 : 4
Option 3: 1 : 4
Option 4: 2 : 3
Question : Which among the following is a cooking procedure in which the sugar in the food gets oxidised, turning into a brown colour?
Option 1: Filtration
Option 2: Caramelisation
Option 3: Emulsification
Option 4: Bromination
Question : When the litmus solution is neither acidic nor basic, its colour is_____.
Option 1: green
Option 2: red
Option 3: purple
Option 4: blue
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