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AIR AND POLLUTION, When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is, Carbon(IV)oxide, Nitrogen, Oxygen, Water vapour, Noble gases, Which of the following piece of apparatus can be used for drawing a current of air through a liquid?, Wash bottle, Aspirator, Capillary tube, Thistle funnel, Pipette, The component of air that is removed when air is bubbled into alkaline pyrogallol solution is, Carbon (IV) oxide, Oxygen, Water vapour, Nitrogen, Helium, A sample of air that has been passed through caustic potash will, contain more oxygen than nitrogen, rekindle a glowing splint, have no action on lime water, contain no water vapour, be free of noble gases, When air is passed through potash and then alkaline pyrogallol, the components remaining are noble gases., oxygen and carbon (IV) oxide, oxygen and nitrogen, nitrogen and water vapour, water vapour and carbon (IV) oxide, oxygen and water vapour, The component of air that is removed when air is bubbled into alkaline pyrogallol solution is, carbon (IV) oxide, oxygen, water vapour, nitrogen, helium, When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are, oxygen and water vapour, oxygen and nitrogen, carbon (IV) oxide and noble gases, nitrogen and noble gases, Which of the following gases is lighter than air?, CO2, SO2, HCI, NH3, Which of the following activities is not a source of air pollution?, Cigarette smoking, Carbon dating, Domestic fires, Coal powered station, Which of the following substances causes the depletion of the ozone layer in the atmosphere?, Carbon (IV) oxide, Chlorofluorocarbon, Sulphur (IV) oxide, Hydrocarbons, Which of the following gases is lighter than air?, HCI, CO2, SO2, NH3, A consequence of global warming is, pollution, flooding, increased humidity, low rain fall, A gas that is collected by upward delivery is likely to be, heavier than air, insoluble in water, lighter than air, soluble in water, Which of the following substances is mainly responsible for the depletion of the ozone layer?, Chlorofluorocarbon, Carbon (IV) oxide, Nitrogen, Oxygen, Which of the following substances is mainly responsible for the depletion of the ozone layer?, Oxygen, Chlorofluorocarbon, Carbon (II) oxide, Nitrogen (II) oxide, THEORY, Liquefied air is mainly a mixture of nitrogen and oxygen which can be separated into its component fractions by fractional distillation, [boiling point of nitrogen is -196oC; boiling point of oxygen is -174oC], Name the fraction which distills over first. Give the reason for your answer., Give another industrial application of fractional distillation as a separation technique, (WASSCE 1991 Q, (a) State the method of collecting gases which are denser than air, (WASSCE 1992 Q1(a))