NEET 2003
- Exam
- NEET
- Year
- 2003
- Subject
- Chemistry
- Chapter
- General Principles and Processes of Isolation of Metals
NEET 2003 · Chemistry · General Principles and Processes of Isolation of Metals
The method of zone refining of metals is based on the principle of:
The method of zone refining of metals is based on the principle of:
Options
- Agreater mobility of the pure metal that than that of the impurity
- Bhigher melting point of the impurity than that of the pure metal
- Cgreater noble character of the solid metal than that of the impurity
- Dgreater solubility of the impurity in the molten state than in the solid
Correct answer
D. greater solubility of the impurity in the molten state than in the solid
Step-by-step solution
The principle of zone refining is that the impurities in ore of metal are more soluble in the melted state when compared to the corresponding solid state of the impurities. In the zone refining process, the impurities are concentrated at one end of the block of metal so that the rest of the block is purified.
Related Theory
Zone refining process is very effective in the removal of impurities from semiconducting elements such as Germanium, Gallium, and Silicon. This process is also used in refining high-purity metals.