Question

A slice of bred gives a positive iodine test however if the slice is throughly chewed the test is negative explain why

Answer 1

Answer:

When you chew the bread saliva digests the starch present in it hence it gives negative test. Reason why a slice of bread after chewing gives negative iodine test: ... Iodine gives blue color when it reacts with raw bread due to the presence of starch in it.

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Answer 2

ANSWER:

The bread slice has presence of strach due which it test positive in iodine test.

Where as when we chew it the strach get converted to maltose about 30% by the action of salivary amylase cdue to which test negative.