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 nitric acid cannot be concentrated by boiling ?

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

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

(i) An organic compound A with molecular formula C_(7)H_(8) on oxidation by chromyl chloride in the presence of C Cl_(4) gives a compound B which gives positive Tollen's test. The compound B on treatment with NaOH followed by acid hydrolysis gives two product C and D. C on oxidation gives B which on further oxidation gives D. the compound D on distillation with sodalime gives a hydrocarbon E. Below 60^(@)C , concentrated nitric acid reacts with E in the presence of concentrated sulphuric acid forming a compound F. identify the compounds A,B,C,D,E and F. (ii) Give chemical test to distinguish : Formaldehyde and acetaldehyde.

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

State how you would obtain (i) hydrogen (ii) nitric oxide (iii) nascent chlorine - from nitric acid . State the concentration of nitric acid used in each case.

A chemist has 20% and 30% concentration of nitric acid with him. In an experiment, he mixed x mI of 20% concentration and 9 mI of 30% concentration in one container and in another container he mixed 4 mI of the 20% concentration with x ml of the 30% conentration. Surprisingly, the concentration of acid in both containers came out to be same. What is the value of X ( in ml) ?

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

Give reasons for the following : Nitric acid affects the skin if it accidently falls on it , staining the skin yellow.