Chemistry
Which of these is a heavy gas used in specialized electric lamps?
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What halogen is the most reactive and combines with most elements from around the periodic table?
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What is another name for synthetic gas made from coal?
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Which of the following is produced in alkaline scrubbing and called wet slurry?
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What is added to drinking water and to swimming pools to serve as a disinfectant?
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What is the second-most abundant element in the universe, though it is much less common on Earth?
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