Chemsitry GK

1. “Atoms can neither be created nor destroyed.” This principle was given by? John Dalton
2. Which gas called Laughing Gas popularly? Nitrous oxide
3. In the manufacture of Vanaspati ghee from vegetable oils, which  gas is used? H2
4. Which  is the most abundant organic compound in nature? Cellulose
5. The most important contributor of sea salt is ? Rivers