puzzle 7

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Across
  1. 3. By which method is activated charcoal used to remove dyes from pure elements?
  2. 5. What product is formed when sodium bicarbonate is heated excessively?
  3. 6. silica gel is a ------ material?
  4. 7. caused radioactive pollution off the coast of Kerala?
  5. 11. biofertilizers convert nitrogen into -------
  6. 13. What is the most common tree species used in socio-forestry?
  7. 15. sodium is stored in kerosene to avoid it been ------ in air?
  8. 16. Unit of impedance is ___________.
  9. 17. ------- gives hardness to stainless steel?
  10. 18. electric power reside in the ------ surface of charged conducting material?
  11. 20. Chornobyl disaster is the result of pollution of
Down
  1. 1. On what principle does the washing machine work?
  2. 2. What is Cellulose?
  3. 4. carries food and other elements in plants?
  4. 8. As a vegetable preservative poly______ foam is used.
  5. 9. Silver gets corrosive due to the presence of _______ in the air.
  6. 10. Lead sulphate is not ------ in water
  7. 12. What is the best way to dispose of non-biodegradable waste?
  8. 14. Vitamin 'K' has a specific role in the synthesis of
  9. 19. male mosquitoes get their food from ---- of plants?