92 Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
1). Nitrous oxide
2). Carbon dioxide
3). Chlorofluorocarbon
4). Sulphur dioxide
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1. Which of the following is used to denature ethanol ?
2. Which of the following is not a method of estimating national income?
3. What is the most commonly used Substance in fluorescent tubes?
4. 'Bhopal gas tragedy' 1984 is related to which gas
5. Which of the following is not present in German silver
6. Which one of the following is radioactive
7. The total energy of revolving electron in an atom
8. Which of the following gases will effuse out of football bladder most quickly