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Arrange the following reactions in corre...

Arrange the following reactions in correct order.
i)` SO_(3)+H_(2)SO_(4)rarrH_(2)S_(2)O_(7)`
ii) `H_(2)S_(2)O_(7)+H_(2)Orarr2H_(2)SO_(4) `
iii) `S+O_(2)rarrSO_(2)` iv)` SO_(2) +O_(2)rarrSO_(3)`(in presence of `V_(2)O_(6)`/ 450 C

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i) `S+O_(2)rarrSO_(2)`
ii)`2SO_(2)+O_(2)rarr(V_(2)O_(6), 450 degree celcius)2SO_(3)`
iii) `SO_(3)+H_(2)SO_(4)rarrH_(2)S_(2)O_(7)`
iv) `H_(2)S_(2)O_(7)+H_(2)Orarr2H_(2)SO_(4)`
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