51. Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
52. Which of the following is used as a coagulant in treating turbid water?
53. Antibiotic . . . . . . . .
54. __________ paper is used in the manufacture of newsprint paper.
55. Digestion of wood-base materials (for manufacture of pulp) is done to
56. Raw materials for 'Solvay Process' for manufacture of the soda ash are
57. Penicillin is separated from fermented broth by
58. Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and
59. Calcareous & argillaceous materials are used in the manufacture of
60. Chemical name of aspirin (an analgesic drug) is
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