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A sample of fuming H2SO4 contains H2SO4,...

A sample of fuming `H_2SO_4` contains `H_2SO_4,SO_3` and `SO_2.2.0g` of the above sample was dissolved in water to make a 500 mL solution. 50 " mL of " the above solution on titration in presence of methyl orange requires 42.4 " mL of " 0.1 N NaOH. On the other hand , 100 " mL of " the same sample solution requires 1.85 " mL of " 0.1 N of `I_2` where `I_2` is reduced to `I^(ɵ)` ions. Determine the percentage composition of oleum sample. (In methyl orange,
`SO_2+H_2OtoH_2SO_3overset(NaOH)toHSO_3^(ɵ))`

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