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ICSE Class 10 Chemistry 2017 Solved Paper

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Question : 59
Total: 86
Write balanced chemical equations to show how SO3 is converted to Sulphuric acid in the contact process.
Solution:  
‌SO3+
H2SO4
(conc.)
→
H2S2O7
(aleum)
‌H2S2O7+H2O→2H2SO4
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