Answer:
:
Each part: 1.5 Marks
(a) Yes, the rusting of iron nails is faster in coastal areas than in desserts.
For rusting, the presence of both oxygen and water is essential.
In coastal areas humidity is much higherthan in desserts.
The content of moisture in the air is more in coastal areas than in dessert. So the process of rusting becomes faster in coastal areas.
(b)The correct sequence of processes in water purification is:
Sedimentation - For removal of heavy particles.
Loading - For removal of the suspended particles.
Filtration - For removal of small particles which cannot be removed by sedimentation and loading.