Question

Cut surfaces of fruit and vegetables often become dark because 1) dirty knife makes it dark 2) oxidation of tannic acid in the presence of trace of iron from the knife makes it dark. 3) dust of the air marks it dark 4) none of the above.

Answer 1

Answer:

2) oxidation of tannic acid in the presence of trace of iron from the knofe makes it dark

Answer 2

Answer is 2nd option

oxidation of tannic acid in the presence of trace of iron from the knife makes it dark