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1. The most abundant metal in the earth’s crust is –

2. The gas used to extinguish fire is –

3. In which of the following activities Silicon Carbide is used ? 
4. The two elements that are frequently used for making transistors are –

5. Which of the following gas is not known as green house gas ?

6. Which of the following is not a neutral oxide ?

7. Potassium Permanganate is used for purifying drinking water, because –

8. The presence of which of the following salts in water causes corrosion in steam boilers ?

9. Water is a good solvent of ionic salts because –

10. Nuclear fission is caused by the impact of –

11. Which is a good nuclear fuel ?

12. Long distance photography is facilitated by –

13. Which of the following is used in making artificial sweetener saccharine ?

14. Rayon is chemically –

15. Which of following is used as a filter in rubber tyres ?

16. Which of the following substances exhibit the property of sublimation ?

17. Combustion is the process in which –

18. The chemical used as a fixer in photography is –

19. Vitamins are –

20. Richest source of vitamin B1 (thiamine) is –

21. One of these vitamins is called erythrocyte maturation factor –

22. Saponification involves the hydrolysis of fats and oils by –

23. Photo-synthesis is a/ an –

24. Which of the following is a physical change ?

25. The process by which an organic compound breaks down into simpler compounds on heating to high temperature is known as –

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