41. Alum is commercially produced from
42. Which of the following is not an abrasive material ?
43. Ethanol amine is produced using ammonia and
44. Hydrocynic acid (HCN) is used as an insecticide for
45. Sodium bisulphite is used for __________ water.
46. Zeolite is used in the
47. Chloral is used in the manufacture of
48. Mannheim furnace is used in the manufacture of
49. Fourdrinier machine is used in the manufacture of
50. Yeast is used in the manufacture of
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