Saved Bookmarks
| 1. |
(a) Why is an iron grill painted frequently ?(b) Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air. |
|
Answer» (a) An iron grill is painted frequently to prevent its rusting . (b)There is less corrosion of aluminium than iron when both are exposed to air because aluminium forms a layer of aluminium oxide on its surface as soon as it comes in contact with moist air. This aluminium oxide is very tough and prevents it from corroding right through. |
|