Q51 of 400 Page 192

How does the painting of an iron object prevent its rusting?

When a coat of paint is applied to the surface of an iron object, it prevents air and moisture to come in contact with the object; hence no rusting takes place.

More from this chapter

All 400 →
50 Name an alloy of copper. State its chemical composition and any one use. 50 Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as? 51 How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper ? 51 What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.