Formation of ozone hole is maximum over
1). Africa
2). India
3). Antarctica
4). Europe
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2. In galvanization, iron is coated with
3. Question 14.21:What are nucleic acids? Mention their two important functions.
5. Cement is formed by strongly heating a mixture of
7. Where does the oxygen that keeps us alive come from?
8. The major constituent of gobar gas is
9. Which one of the following metals does not react with water to produce Hydrogen ?