Why is lead placed in group I as well in II?

Explanation

To understand why lead (Pb²⁺) is placed in both group I and group II in qualitative inorganic salt analysis, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Identification of Lead Ion**: Lead exists in the form of the cation Pb²⁺ in aqueous solutions.

2. **Group I Analysis**:
- In group I of qualitative analysis, the group reagent is dilute hydrochloric acid (HCl).
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