Chemistry

Which of the following substances is industrially prepared by the contact process?

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Who wrote the book "The Principles of Chemistry"?
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Which of these is a heavy gas used in specialized electric lamps?
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What is the inherent voltage of lithium?
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What attribute does the Pauling scale measure?
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What symbol appears on the periodic table for Oxygen which has the atomic number 8?
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What is the name of the temperature at which Helium I becomes Helium II?
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In RNA thymine from DNA is replaced by what?
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How many elements with atomic number below 100 have their symbols starting with an upper case T?
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