NCERT 8th Class (CBSE) Science: Coal and Petroleum
· Answer: Destructive distillation of coal is carried out by heating coal strongly to 1000°C in the absence of air. It yields various useful organic and inorganic products. These products are – Coke, Coal gas, Coal tar and Ammonium compounds. Question: Why petroleum is also called black gold? Answer: The constituents of petroleum are very ...