Question

What will happen if concentrated nitric acid is added to cocentrated sulphuric acid?

Answer 1

There is no chemical reaction. H + NO3 and H2 + SO4 will give an equilibrium of the ions and the acid. Now, it is possible that if you add concentrated sulfuric acid to the nitric it can become hot enough to break the HNO3 into water and NO2 (gas). Has to do with heat, not a reaction between the two.