Which of the following statements is not correet ?

Options

A. Lead salts are slow poisons .
B. Lead metal is used in accumulators
C. Plumbosolvency increases by the presence of carbonates sulphates phosphates etc .
D. Lead is a soft metal

Answer

To determine which statement is not correct regarding lead and its properties, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement: "Lead salts are slow poisoners."**
- Lead is known to disrupt various biochemical processes in the body, making this statement true. Lead salts can accumulate in the body and cause toxicity over time.
- **Conclusion:** This statement is correct.

2. **Analyze the Second Statement: "Lead metal is used in accumulators."**
- Accumulators are devices that store energy, and lead is indeed used in lead-acid batteries (a type of accumulator). This is a well-established fact in chemistry and electrical engineering.
- **Conclusion:** This statement is also correct.

3. **Analyze the Third Statement: "Plumbosolvency increases by the presence of carbonate, sulfates, phosphates, etc."**
- Plumbosolvency refers to the solubility of lead (II) salts in water. The presence of carbonate, sulfate, and phosphate ions tends to form insoluble precipitates with lead ions (e.g., PbCO3, PbSO4, Pb3(PO4)2). Therefore, the solubility of lead salts actually decreases in the presence of these ions.
- **Conclusion:** This statement is false, making it the answer we are looking for.

4. **Analyze the Fourth Statement: "Lead is a soft metal."**
- Lead is classified as a soft metal, which is true. It can be easily cut with a knife and has a low tensile strength compared to other metals.
- **Conclusion:** This statement is correct.

### Final Answer:
The statement that is not correct is **C: "Plumbosolvency increases by the presence of carbonate, sulfates, phosphates, etc."**

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