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Explain why, air is considered a mixture and not a compound. |
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Answer» Air is considered a mixture because of the following reasons: a. Air can be separated into its constituents like oxygen, nitrogen, etc., by the physical process or fractional distillation (or liquid air). b. Air shows the properties of al the gases present in it. For example, oxygen supports combustion and air also supports combustion; carbon dioxide turns lime- water milky and air also turns lime-water milky, though very, very slowly. c. Heat and light, etc., are neither given out nor absorbed when air is prepared by mixing the required proportions of oxygen, nitrogen, carbon dioxide, argon, water vapour, etc. d. Air has a variable composition because air at different places contains different amounts of the various gases. It does not have a definite formula. e. Liquid air does not have a fixed boiling point. |
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