The depletion of ozone layer is due to
A). Chlorofluorocarbons
B). Carbon dioxide
C). Sulphur dioxide
D). Ethane
Chlorofluorocarbons
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.
2. The number of neutrons present in an element having mass number 226 and atomic number 88 is :
3. Froth floatation process to concentrate the minerals is applicable to
4. Which among the following has the maximum density?
5. Question 6.20:Why is zinc not extracted from zinc oxide through reduction using CO?
6. Which of the following is the maximum number of electrons that can be present in M-shell?
7. Which one of the following metals is used to galvanise iron
8. What is the element that is in the highest percentage in the composition of the earth ?
10. The process of improving the quality of rubber by heating it with sulphur is called