Chemistry
What mineral has the chemical formula PbS?
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Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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What is the most commonly used material in the manufacturing of semiconductors?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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What symbol appears on the periodic table for Unnilquadium which has the atomic number 104?
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Which of the following is the list of hydrogen halides of group 7A from highest boiling point to lowest?
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