An aqueous compound of an inorganic compound `(X)` shows the following
Channel: Doubtnut
Date: 2020-07-26

An aqueous compound of an inorganic compound `(X)` shows the following reactions:  a. it decolourises and acidified `KMnO_(4)` solution accompanied by the evolution of oxygen.  b. it liberates `I_(2)` from an acidified `KI` solution.  c. It gives a brown precipitate with alkaline `KMnO_(4)` solution with evolution of oxygen.  d. It removes black stains from old oil paintings. Identify `(X)` and give chemical equtions for the reaction at steps (a) to (d).