51. Cooking liquor in case of sulphite process is
52. The main component of pyrex glass is
53. Main constituent of limestone is
54. Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
55. Catalyst used in the hydrogenation of oil is
56. In the Lurgi coal gasifier
57. Use of chlorine in the treatment of sewage
58. Bleaching of paper pulp is done with
59. __________ is produced using polycondensation reaction.
60. Flux addition during smelting of ore is done to
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