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ICSE Class 10 Chemistry 2017 Paper

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Question : 59 of 86
Marks: +1, -0
Write balanced chemical equations to show how SO3\mathrm{SO}_3 is converted to Sulphuric acid in the contact process.
Solution:  
  SO3+H2SO4(conc.)→H2S2O7(aleum)\; \mathrm{SO_3} + \mathrm{H_2SO_4}_{\text{(conc.)}} \rightarrow \mathrm{H_2S_2O_7}_{\text{(aleum)}}
  H2S2O7+H2O→2H2SO4\; \mathrm{H}_2\mathrm{S}_2\mathrm{O}_7 + \mathrm{H}_2\mathrm{O} \rightarrow 2\mathrm{H}_2\mathrm{SO}_4
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