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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

AIIMS 2019 · 26 May · Chemistry · General Principles and Processes of Isolation of Metals

Assertion : ZrI_4 is useful in purification of zirconium (Zr)....

Assertion : ZrI4\mathrm{ZrI}_4 is useful in purification of zirconium (Zr). Reason : ZrI4\mathrm{ZrI}_4 sublimise at room temperature.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

van-Arkel process \underset{\text{ (Impure) }}{\mathrm{Zr}+2\mathrm{I}_2} \stackrel{870 \mathrm{ K}}{\longrightarrow} \mathrm{ZrI}_4 \underset{\substack{\text{ Tungsten } \\ \text{ filament }}}{\frac{1800 \mathrm{ K}}{\longrightarrow}} \underset{\text{ (Pure) }}{\mathrm{Zr}+2\mathrm{I}_2}ZrI4\mathrm{ZrI}_4isacovalentvolatilesubstancewhichgetsdecomposedbyheatingoveratungstenfilamentatis a covalent volatile substance which gets decomposed by heating over a tungsten filament at1800 K\mathrm{ K} to give pure Zr\mathrm{Zr}.
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