White lead is a compound that has been used for various purposes throughout history, including as a pigment in paint, cosmetics, and medical treatments. It is known for its distinctive white color and ability to provide a smooth and opaque finish.

The correct answer for the compound represented by white lead is option 'C', which is basic lead carbonate (PbCO3). Basic lead carbonate is a compound formed by the reaction of lead(II) acetate (Pb(CH3COO)2) and carbon dioxide (CO2) in the presence of water. This reaction results in the formation of basic lead carbonate as a white crystalline solid.

Explanation:
- Basic lead carbonate is formed by the reaction between lead(II) acetate and carbon dioxide. The reaction can be represented by the following equation: Pb(CH3COO)2 + CO2 + H2O → PbCO3 + 2CH3COOH.
- The reaction occurs in the presence of water, and the resulting compound is a white crystalline solid.
- Basic lead carbonate has the chemical formula PbCO3 and is composed of lead ions (Pb2+) and carbonate ions (CO32-).
- The compound is basic because it contains hydroxide ions (OH-) within its crystal structure. The presence of these hydroxide ions gives basic lead carbonate its alkaline properties.
- Basic lead carbonate is insoluble in water and has a low solubility in acids. This makes it suitable for use as a pigment in paint, as it remains stable and does not dissolve easily.
- The compound has been widely used as a white pigment due to its ability to provide a smooth and opaque finish. It has been used in various applications, including in art, cosmetics, and medical treatments.
- It is important to note that white lead has been phased out in many countries due to its toxicity. Lead is a toxic substance, and exposure to high levels can cause serious health issues. Therefore, alternative pigments and materials are now used in place of white lead.