The function of skimming tank in sewage treatment is to remove
1). oil and fatty substances
2). suspended solids
3). Charcoal
4). Camphor
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2. Which of the following is used as raw material for the manufacture of rayon?
3. Photo oxidation process is initiated by
6. Question 3.26:What are the major differences between metals and non-metals?
7. The element used for making solar cells is
8. The minimum energy required for an effective collision is
9. The chief source of naphthalene is
10. A substance which readily forms colloidal solution in contact with water is called