Question

In zone-refining method, the molten zone:

• A. consists of impurities only
• B. contains more impurity than the original metal
• C. contains the purified metal only
• D. moves to either side

Answer 1

Answer: (B)

contains more impurity than the original metal

Zone-refining process is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the crystal. The molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot. It typically contains more impurity than the original metal.