Solve this multiple-choice question and choose the correct option.

Materials purification: Zone refining is typically used to purify which type of materials? Focus: Ultra-high purity for electronic/semiconductor applications. Choose the best example.

Difficulty: Easy

Copper (Cu) for wiring
Germanium (Ge) for semiconductors
Iron (Fe) for construction steel
Silver (Ag) for jewelry

Correct Answer: Germanium (Ge) for semiconductors

Explanation:

Concept

Zone refining moves a molten zone along a rod; impurities concentrate in the melt and are swept to one end. It is used for semiconductors like Ge and Si.

Final Answer
Germanium (Ge) for semiconductors.

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