71. Carborundum is another name of
72. German silver is an alloy of
73. Which one of the following does not contain Silver ?
74. Type metal used in printing press is an alloy of
75. Ultra purification of a metal is done by :
76. Brass gets discoloured in air due to constant exposure in presence of:
77. Which of the following is not present in German silver?
78. Haloarenes are more stable than haloalkanes due to
79. The unit of ionic product of water (Kw) is :
80. Aluminium chloride is
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