Question

We have two test tubes X and Y. X contains boiled rice and Y contains boiled rice that has been completely chewed on. Which one is likely to turn blue-black on adding an iodine solution?
I.Test tube Y.
II.Test tube X.
III Neither X nor Y.
IV.Both X and Y.

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Answer 1

Answer:

Test tube X because on boiling the starch of rice is been evaporated with water

Answer 2

Answer:

Here here the answer will be test tube X

This is because the boiled rice that was chewed on in test tube Y has been broken t will turn in tby the salivary amylase in your mouth which breaks down starch to maltose hence it will not turn blue black because there is no starch as it was Broken down by the salivary amylase. But in X it will turn into blue black as it contains starch