The _____ is the lowest layer of the atmosphere, extending from Earth's surface to an altitude of about 11-13 km (7-8 mi).
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Q78: _ are catalysts that occur naturally in
Q79: In the reaction Mg + 2HCl
Q80: The component of the atmosphere present in
Q81: Which of the following reactions shows
Q82: Write a note on the formation and
Q83: _ is an example of a chlorofluorocarbon.
Q84: CFCs are exposed to intense ultraviolet light
Q85: _ are hydrocarbons in which only some
Q87: _ is an unstable form of oxygen
Q88: Which of the following is not a
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