Question

Assertion : van Arkel method is used for refining of zinc.
Reason : In this method impure metal is evaporated to obtain the pure metal as distillate.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

van Arkel method is used for refining of zirconium or titanium.
In this method crude metal is heated in an evacuated vessel with iodine.
$\underset{\text { Impure }}{ Zr }+2 I _{2} \xrightarrow{\Delta}ZrI _{4}$
The metal iodide is decomposed on tungsten filament, and pure metal is deposited on the filament.
$ZrI _{4} \xrightarrow{\Delta} \underset{\text { pure }}{ Zr }+2 I_{2}$