Nitric acid can not be concentrated beyond `68%` by direct distillation ? Why? 

Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO_3 . State 'the reason.

Why nitric acid cannot be concentrated by boiling ?

State why nitric acid (i) stains the skin (ii) cannot be concentrated beyond 68% by boilling.

Dilute HNO_3 cannot be concentrated beyond 68 % by boiling because.

Why a dilute aqueous solution of hydrochloric acid cannot be concentrated by evaporation beyond 22.2%?

State why dilute HCl cannot be concentrated beyond a certain concentration by boiling.

Why can't rectified spirit be converted into absolute alcohol by simple distillation ?

In the preparation of nitric acid from KNO_3 , concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Give reason.

Can you concentrate nitric acid beyond 68% by boiling, if not then how is it concentrated ?

S-I: Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid S-II: The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, nitronium ion.