What is the basis of classification of cations into different group ?

Explanation

### Step-by-Step Solution:

1. **Understanding Cations**: Cations are positively charged ions that are formed when an atom loses one or more electrons. They play a crucial role in various chemical reactions and processes.

2. **Basis of Classification**: The classification of cations into different groups is primarily based on their solubility in water and their behavior in the presence of different reagents.

3. **Group Classification**:
- **Group 1**: This group consists of cations that form insoluble chlorides. Examples include:
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