In upper layer of atmosphere ozone is formed
1). the action of ultraviolet rays on oxygen
2). the combination of oxygen molecules
3). subjecting oxygen to high pressure
4). the action of nitrogen on oxygen in atmosphere
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1. Question 8.6:Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?
2. The addition of gypsum to Portland cement helps in :
3. The process of improving the quality of rubber by heating it with sulphur is called
4. Domestic cooking gas consists mostly of
5. Bhopal gas tragedy is associated with leakage of
6. Helium gas is filled in ballons because
8. Soap is prepared by boiling caustic soda with
9. Ozone saves the biosphere by absorbing high energy radiations called ________ .