Question

Please give me the full solution ​

Answer 1

Answer:

3

Explanation:

Here, you just need to look at the oxidation state of the Mn atom.  

In KMnO4 - the Mn is +7.  

If you put it in an acidic medium, you get this:  

MnO4¯ + 8H+ + 5e- → Mn2+ + 4H2O  

As you can see, Mn gives up 5 electrons. (Making it an oxidizing agent.)  

In a strongly alkaline solution, you get:  

MnO4¯ + e- → MnO42-  

So, it only gives up one of it's electrons. Making it a much weaker oxidizing agent.  

(In a neutral solution, it gives up 3 electrons to form MnO2 and some hydroxide ions.)