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. The fiber least prone to catch fire is
2. Name the gas used in preparation of bleaching powder
3. In the ordinary fire extinguisher, carbon dioxide is generated by the reaction of
5. _______ fiber is used in making bulletproof vests.
6. The wire of flash bulb is made of:
8. The metal chiefly used for galvanising iron is :
9. Question 5.6:What do you understand by activation of adsorbent? How is it achieved?