1.

A slice of bread gives a positive iodine test however if the slice is throughly chewed the test gives negative explain with reason​

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Answer:

It comes positive at first because it contains starch, after CHEWING it becomes negative because the SALIVA contains enzymes called salivary amylase which breaks down starch into simple sugars , like maltose and dextrin. When you chew the bread saliva digests the starch present in it HENCE it gives negative test.

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