Question

Assertion: Zirconium can be purificed by Van Arkel method.

Reason: ZrI₄ is volatile and decomposes at 1800 K.

Options

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

• Both assertion and reason are true but reason is not the correct explanation of assertion.

• Assertion is true but reason is false.

• Assertion is false but reason is true.

• Assertion and reason both are wrong.

Answer 1

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

Explanation:

van Arkel 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 and then decomposes at 1800 K to given pure Zr.

\[\ce{Zr + 2I2 -> ZrI4}\]

\[\ce{ZrI4 ->[1800K] Zr + 2I2}\]