In zone refining method, the molten zone : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Zone refining is based on the principle of fractional crystallization, which states that impurities are more soluble in the molten state (melt) than in the solid state of the metal. Step 2: When a circular heater moves slowly along an impure metal rod, the molten zone moves along with it. Step 3: The impurities selectively partition into the liquid phase, meaning the molten zone contains a higher concentration of impurities than the original solid metal. Thus, option (b) is correct.