Q9 / 90 · JEE Main 2023 (31 Jan Shift 2) · Chemistry

Which one of the following statements is incorrect ?

  • Correct answer
    A
    van Arkel method is used to purify tungsten.
     
  • B
    The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
     
  • C
    Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
     
  • D
    Boron and Indium can be purified by zone refining method.

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:
Zr + 2I2 → ZrI4
The metal iodide is decomposed on a tungsten filament, electrically heated to about 1800 K.
ZrI4 → Zr + 2I2

Hence, the correct answer is option: 'A'.

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