(i) Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory.(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases, does the litmus paper show change in colour ?(iii) State the reason of exhibiting acidic character by dry HCl gas//HCl solution.

(i) Draw a labelled diagram to show the preparation of hydrogen chlori

1.	(i) Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory.(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases, does the litmus paper show change in colour ?(iii) State the reason of exhibiting acidic character by dry HCl gas//HCl solution.
Answer» Solution :(i) LABELLED diagram for the preparation of HCl gas in the laboratory. (ii) There is no effect on dry litmus paper but wet litmus paper turns red. (III) HCl gas dissolves in water to GIVE `H_3O^(+)` or `H^(+)`. `HCl+H_2OrarrH_3O^(+)+Cl^(-)` Thus, HCl exhibits acidic CHARACTER because of `H_3O^(+)`.