16. The layer containing petroleum oil & gas is
17. Water is a ..........
18. When coal burns in air then
19. When heated in air produces
20. Which gas is obtained during the processing of coal?
21. Which is an almost pure form of carbon?
22. Which of the following is manmade resource?
23. Which of the following is natural resource?
24. Which of the following is obtained from coal tar ?
25. Petrol and diesel can be obtained from
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