Which of the following is ferromagnetic compound ?

Options

A. `BaTiO_3`
B. `K_4Fe(CN)_6`
C. `Pb_2^(-)O_3`
D. `Al_2C_3`

Answer

To determine which of the given compounds is a ferromagnetic compound, we need to understand the properties of ferromagnetic materials. Ferromagnetic compounds are those that exhibit strong attraction to a magnetic field and retain their magnetic properties even after the external magnetic field is removed.

Let's analyze the given options step by step:

1. **Identify the Options**: The options provided are:
- A) BaTiO3
- B) K4Fe(CN)6
- C) Pb2O3
- D) Al2C3

2. **Understanding Each Compound**:
- **BaTiO3 (Barium Titanate)**: This is a ferroelectric material, but it is not typically classified as ferromagnetic. It exhibits piezoelectric properties and is used in capacitors.
- **K4Fe(CN)6 (Potassium Ferrocyanide)**: This compound contains iron, but it is not ferromagnetic. It is a coordination compound and is known for its use in various chemical applications.
- **Pb2O3 (Lead(II) Oxide)**: This compound does not exhibit ferromagnetic properties. Lead oxides are generally not magnetic.
- **Al2C3 (Aluminum Carbide)**: This compound is also not ferromagnetic. It is primarily used in ceramics and does not exhibit magnetic properties.

3. **Conclusion**: After analyzing the options, none of the compounds listed are typically classified as ferromagnetic. However, if we consider the general knowledge about ferromagnetic materials, we can conclude that the question may have an error in the options provided, as none of them are ferromagnetic.

**Final Answer**: None of the given compounds are ferromagnetic.