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Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
Neon
Radon
Xenon
Argon
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Which of these is the primary component of natural gas?
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Triphenylphosphine can be used to prepare which of the following?
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What element has an atomic number of 40?
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What element in a liquid state is used in the cryogenic cooling of devices and materials?
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The name for iodine comes from the Greek word "iodes", which means what color in English?
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Which of these is a significant greenhouse gas?
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Which is not a component of black powder?
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