91. Which one of the following elements is an example of noble gas ?
92. Helium gas is filled in balloons because
93. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is
94. At room temperature, the metal that remains liquid is:
95. A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be
96. Which of the following is very reactive and kept in kerosene?
97. Which metal does not undergo corrosion due to the formation of oxide layer?
98. The wire of flash bulb is made of:
99. Identify the metal which is non toxic in nature.
100. Iron rusts quickly in
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