71. Galvanised iron is made by coating iron with
72. Slag is a name given for
73. Solder is an alloy of
74. Solder is an alloy of
75. Solder metal is an alloy of
76. The most important ore of lead is
77. Steel contains
78. Which is the purest commercial form of iron ?
79. The most abundant metal in the Earth’s crust is
80. The ore of Aluminium is
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