The metal refined by Van Arkel method is

The correct answer is Option (2) → Zr

The van Arkel method refines zirconium and titanium. The crude metal forms a volatile iodide with iodine, and the iodide is decomposed on an electrically heated tungsten filament:

    \( \ce{Zr + 2I2} \xrightarrow{\Delta} \ce{ZrI4} \)

    \( \ce{ZrI4} \xrightarrow[\text{W filament}]{\text{about 1800 K}} \ce{Zr + 2I2} \)

Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.

NCERT (Pre-rationalised edition, 2022-23):
Van Arkel Method for Refining Zirconium or Titanium