What do you mean by activity and selectivity of catalysts ?

Explanation

To answer the question about the activity and selectivity of catalysts, we can break it down into two main parts: defining each term and providing examples to illustrate the concepts.

### Step-by-Step Solution:

1. **Define Activity of a Catalyst**:
- The activity of a catalyst refers to its ability to increase the rate of a chemical reaction. Catalysts provide an alternative pathway for the reaction with a lower activation energy, thus speeding up the reaction without being consumed in the process.

2. **Example of Activity**:
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