Question

oxidation reaction has some harmful effect. comment on the sentence

Answer 1

rust of iron
damging of prestigious monuments like Taj Mahal
and many others

Answer 2

The houses maded from bricks joined on iron bars. During the rainy season these iron bars reacts with water and oxidizes we called as rust. These rust can damage the iron bars.
This attacks the iron due to moisture.
Any acid when reacts with water it oxidizes and convert into water and salt.