# Kerala PSC - Important and Repeated General Science Questions - 11

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 _____ .