InterviewSolution
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InterviewSolution
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(a) Oxidation of sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Explain how does this happen. Give chemical reactions for the conversion of SO2 into SO3.(b) How is ozone produced in stratosphere?(c) What is the compound formed when CO combines with blood? |
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Answer» (a) The presence of particulate matter in polluted air catalyses the oxidation of SO2 to SO3. The reaction is also promoted by ozone and hydrogen peroxide. 2SO2 + O2 \(\overset{Dust\,or\,soot\,particles}{\rightarrow}\) 2SO3 SO2 + O3 \(\overset{hv}{\rightarrow}\) SO3 + O2 SO2 + H2O2 → H2O + SO3 (b) The formation of ozone in the stratosphere takes place in two steps. In the first step, ultraviolet radiation coming from the sun has sufficient energy to split dioxygen into two oxygen atoms. In the second step, the oxygen atoms react with more of dioxygen to form ozone. O2 \(\overset{hv}{\rightarrow}\) O + O, O + O2 → O3 (c) Carboxyhaemoglobin (COHb). |
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