__________ is an ore concentrating metallurgical process involving a chemical change.

A. Electromagnetic separation

B. Froth floatation

C. Roasting

D. None of these

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  1. Temporary hardness of water can be removed by
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  4. A 'unit process' is exemplified by the
  5. All enzymes are made of
  6. Zeigler process
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  8. Sulphuric acid saturated with SO3 is called
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  10. Dechlorination of treated water is necessary to
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  14. Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.
  15. Which of the following is not required in the manufacture of soda ash by Solvay process?
  16. __________ of quicklime produces slaked lime.
  17. More than 100 percent of __________ is present in oleum.
  18. Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result…
  19. The drug used in contraceptives is
  20. Rosin soap is added during paper manufacture to
  21. Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome…
  22. For the hydrogenation of oils, __________ (i) __________ is commonly used as catalyst and __________…
  23. Oxygen is produced by fractionation of air using __________ process.
  24. Electric bulbs are made of __________ glass.
  25. __________ is an ore of lead.
  26. Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
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