The Question is from neet-chemistry general-principles-and-processes-of-isolation-of-e refining, and it was created by the author Mr. S M HUSSAIN

Question

Zone refining is based on the principle that impurities are more soluble in the:

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Zone refining
 **Related Topics**: Purification of metals, solubility, phase equilibrium
 **Prerequisites**: Understanding of solubility and phase diagrams.
## SOLUTION PATHWAY
**Given Information**:
The question asks about the principle behind zone refining.
**Method & Steps**:
 1. Understand Zone Refining:
  Reasoning: Zone refining is a purification technique used for semiconductors and other materials. It relies on the difference in solubility of impurities in the solid and liquid phases of the material.
  Formula/Rule:  No specific formula is needed here, it's a conceptual understanding.
 2. Analyze Solubility Differences:
  Working: The process involves melting a small zone of the material and moving this molten zone along the length of the solid. Impurities are more soluble in the molten zone than in the solid state. As the molten zone moves, impurities concentrate in the molten zone and are effectively swept to one end of the material.
  Key Point: The effectiveness of zone refining depends on a significant difference in the solubility of the impurity in the solid and liquid phases.
 3. Identify Correct Option:
  Result: Option A correctly states that impurities are more soluble in the melt (liquid) of the metal than in the solid state of the metal. This is the fundamental principle upon which zone refining is based.
  Verification: The other options are incorrect because they contradict the principle of zone refining.
 ## OPTION ANALYSIS
A ✓: Impurities are more soluble in the melt than in the solid state. This is the core principle of zone refining.  The molten zone acts as a solvent that preferentially dissolves impurities.
B :x: This is incorrect. If impurities were more soluble in the solid state, they wouldn't be effectively removed by the molten zone.
C :x: This option is irrelevant to zone refining. Zone refining primarily deals with the solid and liquid phases.
D :x: This option is also irrelevant to the process.  Zone refining doesn't involve the vapor phase significantly.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing solubility in solid and liquid phases:  Remember that the key is the *difference* in solubility, not the absolute solubility in either phase.
  2.Thinking zone refining involves vaporization: Zone refining is a solid-liquid process, not a solid-vapor process.
 **Quick Tips**:
  1.Visualize the molten zone moving along the solid and carrying impurities with it.
  2.Remember that 'zone refining' implies a 'zone' of melt moving through a solid.

Mr. S M HUSSAIN · Answer

The correct Option is "melt of the metal than in the solid state of the metal"

Mr. S M HUSSAIN · Answer

solid state of the metal than in the melt of the metal

Mr. S M HUSSAIN · Answer

vapour phase of the metal than in the liquid state of the metal

Mr. S M HUSSAIN · Answer

solid state of the metal than in the vapour phase of the metal

NEET Chemistry General Principles And Processes Of Isolation Of Elements Refining MCQs

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