Across
- 4. Hardest coal with more than 86% of carbon content.
- 5. tar Plastic, drugs, naphthalene balls all are prepared from this.
- 6. First stage of coal, looks like manure.
- 10. Ammonium hydroxide solution.
- 12. Coal tar and coke are distilled from this type of coal.
- 15. Pure form of carbon with 90% carbon.
- 16. They can be substituted or replaced.
- 17. They are limited, cannot be substituted or replaced.
- 19. Material that exist freely in nature.
Down
- 1. Process of conversion of dead vegetation into coal.
- 2. Black gold made up of hydrocarbons.
- 3. Process of heating a complex substance in limited supply of air to get byproducts.
- 7. The time period in which plenty of coal has formed.
- 8. Contains 60% of carbon, used in thermal power station.
- 9. Various components obtained after fractional distillation of petroleum.
- 11. gas Mixture of hydrogen, methane and carbon monoxide.
- 13. Coal, petroleum and natural gas are called as _____.
- 14. Process of separating crude oil into usable components.
- 18. Compounds made of only carbon and hydrogen.