1. Which acid is present in Orange?
2. Lead pencil contains _____ .
3. Which gas is used in filling electric bulbs ______ ?
4. Lightest metal?
5. Acid rain is due to air pollution by?
6. Ozone is _______ .
7. Petroleum is found in ______ .
8. All noble gases are?
9. The most abundant element in the earth's crust is ?
10. The lustre of a metal is due to _______ .
11. Which gas is used in fire extinguisher?
12. Which gas is used in cigarette lighters?
13. Biogas chiefly contains ______ .
14. Chemical used as fixer in Photography is ______ .
15. Aspirin is ______ .
16. _____ is also known as ‘Stranger Gas.’
17. Natural rubber is a polymer derived from ______.
18. ‘Oil of Vitriol’ is ______ .
19. Paper is chemically _______ .
20. Impurity present in ore is ________ .
21. Which is known as ‘Metal of Future’ ?
22. Efficiency of the catalyst depends on its?
23. Most of the explosions in mines occurs due to mixing of ______ .
24. Vinegar is an aqueous solution of ______ .
25. Kerosene is a mixture of _____ .
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