41. The manufacture of Kraft pulp is done by a/an __________ process.
42. Commercially ethylene is produced from naphtha by
43. How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
44. Pick out the wrong statement.
45. Neon gas is
46. Neoprene is a
47. Neoprene is the trade name of
48. H2S is scrubbed from refinery gases by absorption using
49. Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
50. Widely used method for the conditioning of boiler feed water is the
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