41. Use of water having dissolved oxygen in boilers promotes
42. Chrome tanning and vegetable tanning are done for
43. Refractory bricks burnt at very high temperature have got
44. Viscose rayon . . . . . . . .
45. Viscose rayon is
46. Viscose rayon is chemically
47. Vulcanisation of rubber
48. The biochemical treatment applied to sewage effluents is a process of
49. Washing of coal is done to
50. Wax is a
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