1. PVC plastics are obtained from Vinyl chloride by the process of
Polymerization
2. When steam is blown over white- hot coke, we get
Water gas
3. Name the hydrocarbon containing three carbon atoms
Propane
4. Which of the following gives the percentage of carbon dioxide present in the atmosphere?
5. Which of the following substance consists of only one element?
Diamond
6. Most soluble in water is
Sugar
7. This of the following metal is not found in nature?
Plutonium
8. Which material is commonly known as ‘Terylene’?
Synthetic fibre
9. The best conductor of heat among liquid is……
Mercury
10. Avogadro’s law is applicable to…………….
Gases
11. Sugar contains.............
Carbohydrates
12. The element required for solar energy conversion is………
Silicon
13. How many elements occur in nature?
92
14. Potassium Nitrate is used in
Fertilizer
15. When sugar is treated with sulphuric acid we get a very pure form of:
Carbon
16. Carbon dating method is used to determine the age of ……
Fossils
17. Water for civil supplies is commonly purified by:
Chlorination
18. Of the following gems, which one is called “liquid gold”?
19. Which is the gas used for lifting airships and balloons up into the air?
Helium
20. The boiling point of water on the Kelvin scale of temperature is…..
373
21. Lead pencil consists of
Clay and graphite
22. The relative density of gold is
19.30
23. Which chemical element has the atomic number 1?
Hydrogen
24. Every battery has……….terminals.
2
25. Hydrogen has………isotopes
3
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