1. Which of the following element is common to all acids?
Hydrogen
2. Which of following gas is used in refrigerator?
Ammonia
3. Which state of matter contains tightly packed molecules or atoms?
Solid
4. Which of the following forms of coal has the highest carbon content?
Anthracite
5. Which element helps the growth and development of bones?
Calcium
6. Which of the following metals forms an amalgam with other metals?
Mercury
7. Which is the acid produced on a large scale for use in various industries?
Sulphuric acid
8. The main constituents of biogas are
Methane and Carfon-dixide
9. The metal that is present in photo films is
Silver
10. The gas used in manufacture of vanaspati from vegetable oil is……..
Hydrogen
11. Chemical name of water glasses
Sodium silicate
12. Deep blue co lour is imparted to glass by presence of
Cadmium
13. Red co lour is imparted to glass by the presence of
Copper oxide
14. What is considered to be an important solvent?
Water
15. Which mineral is the source for school chalk?
Gypsum
16. Urea is prepared by the chemical reaction of
Ammonia and Carbon dioxide
17. Aviation fuel for Jet aero planes consists of purified
Gasoline
18. Soap is prepared by boiling caustic soda with
Fats
19. Element that does not occur in nature but can be produced artificially is……….
Radium
20. What kind of material is a superconductor of electricity?
Ceramics
21. Which substance is popularly known as ‘Super liquid’?
Liquid Helium
22. Which of the following is a halogen?
Astatine
23. The International Rice Research Institute is located in
24. Pineapple is a…………..
Collection of fruits
25. What drug does Tobacco contain?
Nicotine
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