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Alum is commercially produced from

A. Gypsum

B. Feldspar

C. Galena

D. Bauxite

Correct Answer : D.


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  1. Riboflavin is a/an
  2. CaSO4 . ½H2O is known as
  3. Baking soda is chemically represented by
  4. Most widely and commonly used coagulant for the removal of suspended impurities in water is
  5. Zeigler process
  6. Polyvinyl chloride (PVC) is
  7. Lubricating greases are a mixture of
  8. Pig iron is produced by blast furnaces in India using mostly the iron ore named
  9. Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo.…
  10. Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain…
  11. The purpose of tanning in leather industry is to
  12. Solvay process is used for the manufacture of
  13. A 'unit process' is exemplified by the
  14. An alkali metal salt of Palmitic acid is known as
  15. Pure rectified spirit contains about __________ percent alcohol.
  16. Production of alcohol by fermentation of molasses is a/an __________ process.
  17. Sea water contains about __________ ppm of bromine.
  18. __________ process is used for producing soda ash.
  19. Pasteurisation of milk means
  20. Conversion of CO to CO2 by steam in presence of a catalyst is called
  21. Liquor poisoning generally occurs due to the presence of __________ in it.
  22. Raw materials for 'Solvay Process' for manufacture of the soda ash are
  23. Permanent hardness of water can be removed by
  24. For the hydrogenation of oils, __________ (i) __________ is commonly used as catalyst and __________…
  25. __________ of rubber decreases after its vulcanisation.
  26. Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
  27. Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
  28. Linde process of gas liquefaction employs
  29. The temperature in the calcium carbide furnace is __________ °C.
  30. Which of the following paper does not require a filler during manufacture?