If vapours of dry ammonia gas are brought into contact with red litmus paper, what will happen to the colour of the litmus paper?
What would you observe when :
(a) blue litmus is introduced into a solution of hydrogen chloride gas,
(b) red litmus paper is introduced into a solution of ammonia in water,
(c) red litmus paper is introduced in caustic soda solution?
Why HCl gas is unable to change the colour of a dry blue litmus paper ? What happens if the paper is moistened ?
Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so ?
Ammonia is a brown coloured, pungent-smelling gas which turns moist blue litmus paper into the red colour.