Question

How can you obtain a mixture of potassium chloride from copper II oxide

Answer 1

Manganese dioxide does not undergo any change during the decomposition of potassium chlorate because Manganese dioxide acts as a catalyst in this decomposition reaction.

Explanation:

Now, what do we mean by catalyst? By definition, "Catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change"

Characteristics of a catalyst:

1. Catalysts are used to speed up the rate of the reaction.

2. Usually they remain unchanged at the end of the reaction.

3. Catalysts do not need to be used in big quantities.

4. They do not alter the position of the equilibrium state of a reversible reaction.

5. Catalysts can not start a reaction.

6. Catalysts are generally specific in their action.

Here in the decomposition reaction of potassium chlorate(),

Where  works as a catalyst.

Let's see the reduction reaction,

After canceling out, we get;

So remains unchanged at the end of the process.