Which one of the following is not a greenhouse gas ?
1). Chlorofluorocarbons
2). Methane
3). Carbon dioxide
4). Nitrogen
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1. In addition to hydrogen the other abundant element present on Suns surface is
2. Which metal is extracted from sea water?
3. The element which is used for vulcanizing rubber
4. Major gaseous pollutant of the thermal power station is
5. Which one of the following minerals is found in pure form?
6. One of the best solutions to get rid of non - biodegradable wastes is
7. Rainfall caused by intense evaporation in equatorial areas is called ______________
8. Question 10.13:Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.
9. Question 9.21:[Fe(CN)6]4− and [Fe(H2O)6]2 are of different colours in dilute solutions. Why?
10. The method that cannot be used for removing permanent hardness of water is