Q. Helium gas is used in gas balloons instead of hydrogen gas because it is
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Q. Polythene is industrially prepared by the polymerization of
Q. The most important ore of aluminium is
Q. Which of the following is a regenerated fibre?
Q. The next higher homologue of C6H14 is
Q. Vinegar made by fermentation from cane sugar contains
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Q. The gas inside an electric bulb is
Q. Fixation of nitrogen implies
Q. PVC plastics are obtained from vinyl chloride by the process of
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