Chemistry
What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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The Diels-Alder reaction is an example of which class of reactions?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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What reagent could oxidize an alcohol to a carbonyl?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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Which of the following items is most likely to be fortified with vitamins?
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