An acid turns blue litmus paper or solution ________

(a) When a moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red and then latter gets decolourised. Explain. (b) Iodine is liberated when KI is added to a solution of Cu^(2+) ions but Cl_(2) is not liberated when KCl is added to a solution of Cu^(2+) ions. why?

A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is :

An aqueous solution turns red litmus paper to blue. Excess addition of which of the following solution would reverse the change?

When a blue litmus is dipped into a solution of hypochlorous acid, It turns red and then gets decolourised. Explain.

A gas X is formed when a substance Y is heated with concentrated sulphuric acid. The gas X turns wet blue litmus paper red and gives dense white fumes with ammonia. Write balanced chemical equation for the reaction between gas X and ammonia.

A gas X is formed when a substance Y is heated with concentrated sulphuric acid. The gas X turns wet blue litmus paper red and gives dense white fumes with ammonia. Write balanced chemical equation between Y and conc. H_2SO_4

Select from the list the gas that matches the description given in each case : [Methane , Hydrogen, Nitrogen , Ammonia , Nitrogen dioxide , Chlorine] A basic gas which turns red litmus solution blue.

Select from the list the gas that matches the description given in each case [Hydrogen , Nitrogen,Ammonia,Nitrogen dioxide, Chlorine] A basic gas which turns red litmus solution blue.

______ solutions turn blue litmus paper red. [Basic Acidic]

Give reason for the following within two sentences: i. Hydrogen bromide cannot be prepared by the action of concentrated sulphuric acid on sodium bromide. ii. When a blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red then gets decolourised.