81. Which of the following is not a noble gas ?
82. Milk is a
83. Mixture can be
84. Which one out of the following helps in burning ?
85. Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure?
86. Which among the following metals provides amphoteric oxide ?
87. Impure camphor is purified by
88. Iron filings can be separated from a heterogeneous mixture using the technique of :
89. Electric bulbs are filled with :
90. The most abundant inert gas in the atmosphere is
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