91. Why is stainless steel stainless?
92. Which one of the following elements is never found in nature as a free element?
93. The heaviest natural element is
94. When lead metal reacts with a copper chloride solution,
95. What is the ore of aluminium called?
96. The metal, which is kept in the air for some time, is coated with a layer of green basic carbonate, which is:
97. . . . . . . . . metal does not decay.
98. The process of adding a thin layer of zinc to iron or steel is called:
99. During lime spraying, Ca (OH)2 reacts slowly with CO2 in the air so that the walls to form a thin layer of
100. Which one of the following oxides dissolves in water?
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