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 –
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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