Q7.Boojho took some grains of boiled rice in test tube ?A? and Paheli took boiled and chewed rice in test tube ?S?. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change.
What colour change would they have observed? Give reasons for your answer.
Dear student
The rice in test tube A would turn blue-black in colour due to the presence of carbohydrates ( Iodine turns blue-black in presence of carbohydrates) whereas no colour change would be seen in test tube S ( which has properly chewed up rice mixed with our saliva) as the presence of salivary amylase present in our saliva has already started breaking down carbohydrates into simpler sugar, thus, showing no significant colour change upon addition of iodine.
Hope this helps!
Regards
The rice in test tube A would turn blue-black in colour due to the presence of carbohydrates ( Iodine turns blue-black in presence of carbohydrates) whereas no colour change would be seen in test tube S ( which has properly chewed up rice mixed with our saliva) as the presence of salivary amylase present in our saliva has already started breaking down carbohydrates into simpler sugar, thus, showing no significant colour change upon addition of iodine.
Hope this helps!
Regards