Hydrogen is not found In atmosphere because
1). it is highly inflammable
2). it is the lightest gas
3). it is absorbed by plants
4). it immediately combines with oxygen to form water
2. The monomer of polythene is
3. When lime juice is dropped on baking soda brisk effervescence takes place because the gas evolved is
4. What was the fissionable material used in the bombs dropped at Nagasaki (Japan) in the years 1945?
7. Question 3.13:Explain why cations are smaller and anions larger in radii than their parent atoms?
9. Highest percentage of carbon is found in which form of coal?