Removal of carbon particles from air involves the principle of
1). Precipitation
2). Filteration
3). Electrophoresis
4). Sedimentation
1. Question 7.4:Why does NH3 form hydrogen bond but PH3 does not?
2. The upper part of the heterosphere is composed almost completely of which gas?
3. Identify the metal which is nontoxic in nature
5. Which of the following is the strongest base in aqueous solution ?
6. The most abundant element in the earth’s atmosphere is
7. Question 10.3:Why are alkali metals not found in nature?
8. Setting of plaster of Paris involves
9. 'Vinegar' is a commercial name of
10. Which one of the following elements is least likely to be found in commercial fertilisers?