61. Which of the following is the hardest?
62. A metallic alloy in general as compared to their pure metal components is
63. Thermosetting polymers are
64. Tin coating is not done by
65. Tin vessels are corroded by
66. Most suitable material for high pressure vessel operating at 500 atm. and 500° C is
67. Titanium metal
68. Ferric stainless steels compared to austenitic stainless steels
69. Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
70. A measure of toughness of a material is its
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