NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- General Principles and Processes of Isolation of Metals
NTA Abhyas 2020 · 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 than that of impurity.
- Bgreater solubility of the impurity in the molten state than in the solid.
- Chigher melting point of the impurity than that of the pure metal.
- DAll above the correct
Correct answer
B. greater solubility of the impurity in the molten state than in the solid.
Step-by-step solution
A movable heater is fitted around a rod of impure metal. As heater is moved from one end to another pure metal crystallises while impurities pass on to adjacent melted zone.