Q. In case of humic coals, hydrogen percentage varies from (Solved)
1. 4 to 6 percent
2. 10 to 15 percent
3. 16 to 20 percent
4. 20 to 30 percent
5. None of the above
- a. 4 to 6 percent
1. 4 to 6 percent
2. 10 to 15 percent
3. 16 to 20 percent
4. 20 to 30 percent
5. None of the above