Chemistry

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

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Phosphorous on the periodic table is noted by which symbol?
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What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?
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Which of the following is a pH of an acid?
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What is force that resists the separation of two bodies in contact called?
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What is the formula of sulphuric acid?
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What percentage of acetic acid is legally allowed in vinegar?
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How are neutrons and protons held together in a nucleus?
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What sort of change happens to a head of lettuce when you cut it in half?
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