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During nitratio of benzene using a mixtu...

During nitratio of benzene using a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`, function of conc. `H_(2)SO_(4)` is to increase the rate of reaction by increasing the concentration of `NO_(2)^(+)` according to following reaction.
`HNO_(3)+H_(2)SO_(4) rarr NO_(2)^(+)+HSO_(4)^(-)+H_(2)O`
Here nitric acid acts as

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