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__________ is an ore of lead.

A. Quartz

B. Galena

C. Siderite

D. Chalcopyrite

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. Gun powder uses
  2. Washing soda is chemically represented by
  3. Extraction of __________ employs an electrolytic process.
  4. Hydrochloric acid is also known as
  5. Hydrogenation of vegetable oils is a/an __________ reaction.
  6. Fermentator temperature during production of alcohol from molasses is around __________ °C.
  7. Pick out the false statement pertaining to water treatment.
  8. Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
  9. The ideal pulp for the manufacture of paper should have high __________ content.
  10. Catalytic oxidation of naphthalene produces
  11. Triple superphosphate is manufactured by reacting
  12. Terylene is
  13. Digestion of wood-base materials (for manufacture of pulp) is done to
  14. Phenol formaldehyde
  15. Calgon used in water treatment is chemically
  16. Claude process of gas liquefaction employs
  17. In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
  18. Carbon disulphide is mainly used in the production of
  19. Catalytic oxidation-dehydrogenation of methyl alcohol produces
  20. Which of the following, when pyrolysed, produces Perchloroethylene?
  21. Bio-degradable detergents
  22. Fish contains about __________ percent oil.
  23. Chloramines are used in water treatment for
  24. Oxygen is produced by fractionation of air using __________ process.
  25. Which of the following is not produced on commercial scale from sea water?
  26. __________ is produced by the dehydrogenation of ethyl benzene.
  27. A good quality coal should have
  28. Solvent used for extraction of oil is
  29. Varnish does not contain
  30. High temperature carbonisation of coal takes place at __________ °C.