1. Bleaching action of moist sulphur dioxide is because of its
2. Sulphur dioxide bleaches colouring matter by :
3. Which one of the following is commonly used for pulp bleaching in the paper industry?
4. In upper layer of atmosphere ozone is formed by
5. Which one of the following is used to restore the colour of old oil paintings ?
6. Ozone consists of
7. Ozone layer is present in
8. The presence of ozone in the stratosphere is responsible for
9. The major use of sulphur is in the manufacture of
10. Percentage of lead in lead pencils is
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