Ammonia turns moist blue litmous red.

State whether True or False. Alkali turns moict red litmus white.

Among the following salts, whose aqueous solutions will turn blue litmus paper red-

When moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red and then it gets decolorised. Explain.

In qualitative analysis, a black precipitate is obtained when H_(2)S is passed through an acidified aqueous solution of a salt . A blue coloured solution is obtained on boiling the preciptate with dilute HNO_(3) . The substance obtained on addition of excess of ammonia solution to this blue solution is -