Give the reason for the formation of a light yellow or white ppt. in the group II even if it may not be because of some metal ion.

Explanation

To address the question regarding the formation of a light yellow or white precipitate in Group II, even if it may not be due to some metal ion, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Group II Cations**:
- Group II cations include Pb²⁺ (Lead), Cd²⁺ (Cadmium), Cu²⁺ (Copper), and Hg²⁺ (Mercury). These ions typically form precipitates when treated with reagents like dilute HCl and hydrogen sulfide (H₂S).

2. **Formation of Metal Sulfides**:
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