JEE Main 202331 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2023
- Date
- 31 January
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- General Principles and Processes of Isolation of Metals
JEE Main 2023 · 31 January · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals
Which one of the following statements is incorrect ?
Which one of the following statements is incorrect ?
Options
- Avan Arkel method is used to purify tungsten.
- BThe malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
- CCast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
- DBoron and Indium can be purified by zone refining method.
Correct answer
A. van Arkel method is used to purify tungsten.
Step-by-step solution
van Arkel method is used to purify Zirconium and Titanium. This method is very useful for removing all the oxygen and nitrogen present in the form of impurity in certain metals like Zr and Ti. The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatilises:
The metal iodide is decomposed on a tungsten filament, electrically heated to about .
The metal iodide is decomposed on a tungsten filament, electrically heated to about .