61. __________ does not contain copper as an alloying element,
62. Copper has very low
63. Bearings subjected to light load are made of
64. Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
65. In the kraft (sulphate) process for the paper manufacture, the digestor is made of
66. Which of the following is produced by addition polymerisation?
67. Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
68. Wood metal is not used for making
69. Evaporators used in caustic soda recovery and production plant are made of
70. Silicon percentage in acid resistant cast iron is about
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