Question

A SLICE OF BREAD GIVES A POSITIVE IODINE TEST. HOWEVER, IF THE SLICE IS THOROUGHLY CHEWED, THE TEST IS NEGATIVE. EXPLAIN GIVING REASONS

Answer 1

Iodine gives blue colour when it reacts with raw bread due to the presence of starch in it. ... It digests the starch present in the bread as we chew it. Due to the absence of starch in the chewed bread, the iodine test shows a negative result.

Answer 2

Answer:

Iodine gives blue colour when it reacts with raw bread due to the presence of starch in it. ... It digests the starch present in the bread as we chew it. Due to the absence of starch in the chewed bread, the iodine test shows a negative result.

Explanation:

because the saliva present in our body turns the starch into sugar so the iodine test is negative