(a) When a moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red
Channel: Doubtnut
Date: 2020-07-26

(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?