Question

Is $Mn{{O}_{2}}$ soluble in water.

Answer 1

Hint: $Mn{{O}_{2}}$ is called manganese dioxide. It is an inorganic compound. The solubility of the minerals is going to depend on the reactive elements which are present in the particular mineral. Some inorganic compounds are soluble in water and few are not soluble in water.

Complete answer:
- In the question it is asked if manganese dioxide is soluble in water.
- Manganese dioxide is a blackish color or brown color solid occurs naturally in the form of pyrolusite.
- The iron and manganese salts are oxidized to insoluble salts by dissolved oxygen.
- Therefore the manganese dioxide is insoluble in water.
- Manganese dioxide has the lowest oxidation state so it is going to act as a basic compound.
- Means manganese dioxide is weakly acidic and moderately basic. So, manganese dioxide is amphoteric in nature.
- Manganese dioxide is soluble highly in acids.
- Not only soluble in acids, manganese dioxide is also soluble in ammonium chloride and insoluble in water.
- The other derivative of manganese, manganese tetroxide is also insoluble in water and soluble in HCl.
- The dissolved oxygen is the reason behind the insoluble character of the manganese dioxide in water.

Note:
There is no dissolved oxygen in acids that is why manganese dioxide is soluble in water. Whenever we are going to dissolve the manganese dioxide by using acid, we are supposed to use less concentrated acid. If we add strong acid there is a chance of formation of huge amounts of fumes.