In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices:

Assertion : Zirconium can be purified by van Arkel method .

Reason : ZrI4 is volatile and decomposes at 1800K.

Both assertion and reason are true and the reason is the correct explanation of the assertion.

Zirconium can be purified by van Arkel method which include formation of volatile ZrI4 which decomposes at 1800 K to Zr.
Zr  +  2I₂ → ZrI₄

ZrI₄ → Zr  +  2I₂