Q9 of 16 Page 65

Explain how painting of an iron gate prevents it from rusting.

Rusting of iron articles is due to the exposure of iron to the atmosphere for some time. Painting of iron gate prevents iron from rusting because the layer of paint prevents the iron gate to come in direct contact of atmosphere, water and both. Thus, rusting of iron can be prevented.


More from this chapter

All 16 →
7

Explain why burning of wood and cutting it into small pieces are considered as two different changes.

 8

Describe how crystals of copper sulphate are prepared.

 10

Explain why rusting of iron objects is faster in coastal areas than in deserts.

 11

The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change - A) then it burns (Change - B). The following statements pertain to these changes. Choose the correct one.

(i) Process - A is a chemical change.


(ii) Process -B is a chemical change.


(iii)Both processes A and B are chemical changes .


(iv) None of these processes is a chemical change.