Question

Which among the following elements is obtained in pure form by zone refining process?

• A. Germanium
• B. Tin
• C. Copper
• D. Bismuth

Hint:

Zone refining is primarily used for purifying semiconductors such as germanium and silicon.

Answer 1

The Correct Option is A

Step 1: Understanding zone refining.
Zone refining is a technique used to purify metals, especially semiconductors like germanium. The process involves heating a small region of the metal and moving this molten zone along the metal. Impurities move to the cooler part of the metal and can be removed.

Step 2: Analyzing the options.
(A) Germanium: Correct — Germanium is commonly purified using the zone refining method.
(B) Tin: Tin is not typically purified using zone refining; it is usually refined by other methods.
(C) Copper: Copper is generally purified using electrolysis, not zone refining.
(D) Bismuth: Bismuth is also not refined using zone refining.

Step 3: Conclusion.
The correct answer is (A) Germanium.