Dear student,
HNO3 + H+ -----> H2O + NO2+
Mechanism:
Nitrobenzene (can't draw on this thing, but you should know what it is) + NO2+
---------> Dinitrobenzene (same structure as before, except second NO2 group is positioned in the meta position of the benzene molecule with respect to the original NO2 group) + H+.
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