D And F Block Elements

Zone refining is effective for elements requiring high purity, especially in the semiconductor industry. Elements purified by zone refining include: - Germanium (Ge): Essential for electronic devices.
- Silicon (Si): Crucial for integrated circuits.
- Gallium (Ga): Used in semiconductors.
- Indium (In): Important for LCDs and conductive coatings.
- Boron (B): Used in high-tech applications.
- Nickel (Ni): For ultra-high purity applications. Not typically purified by zone refining: - Titanium (Ti): Purified using the Kroll process.
- Manganese (Mn): Purified using electrolytic refining.
- Silver (Ag): Purified using electrorefining. Thus, 6 elements (Ge, Si, Ga, In, B, Ni) can be purified by zone refining, making the correct answer (2).