Question

Salts of manganese ion is generally:
(A) pink
(B) blue
(C) red
(D) none of the above

Answer 1

Hint: In order to find the colour of the salts of manganese ion we need to find the most stable oxidation state of manganese. As we know that magnesium is found in the free element in nature.

Complete Solution :
We have been provided that we need to find out the colour of the salts of manganese ion,
So, for that:
We need to find the oxidation state of manganese:
So, for that:
- We know that the oxidation state of a compound also known as the oxidation number, describes the degree of oxidation of an atom in a chemical compound.
- Manganese exhibits variable oxidation states starting from +2, +4 and +7 these are quite common but they do exist in more states which are less common like +3, +5 and +6.
- Out of these all oxidation states +2 oxidation states are quite common along with which it is the most stable oxidation state of manganese ions.
The colour of +2 oxidation state of manganese is pale pink so,
The salts of manganese ions are generally pale pink.
So, we can say that the salts of manganese ions are generally pink.
So, the correct answer is “Option A”.

Note: Limitations of Oxidation state:
1. Many times the result of the concept of oxidation state does not resemble that obtained from classical approach.
 2. Further it is difficult to classify some reactions as redox reactions on the basis of concept of oxidation number.