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. Two moles of an ideal gas expand freely into vacuum. The work done by the gas is
2. Percentage of lead in lead pencils is
3. Which of the following gases will effuse out of football bladder most quickly
4. The isotope of Uranium used in atomic reactors is
5. Which one of the following elements is used in the manufacture of fertilizers?
7. What material is used to make electric heater coil
9. Burning pyrites ore gives out
10. Molasses a byproduct in the manufacture of sugar is converted into