Ozone depletion in the atmosphere is mainly caused by
1). sulphur dioxide
2). nitrogen dioxide
3). hydrogen sulphide
4). chlorofluorocarbon
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1. Harvesting season of Kharif crop in India is
2. Which of the following is the petroleum wax
3. The isotope used for the production of atomic energy is
5. The number of waves in n x 10th Bohr's orbit are
6. What happens when a chemical bond is formed ?
7. In galvanization, iron is coated with
8. If a buffer solution is diluted its pH
9. The chief source of naphthalene is
10. The element which is commonly used in nuclear for producing electricity by nuclear fission is