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General Principles and Processes of Isolation of Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Isolation of Elements1 Mark
MCQ
Which of the following options are correct?
$a.$ Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
$b.$ In extraction of silver, silver is extracted as cationic complex.
$c.$ Nickel is purified by zone refining.
$d. Zr$ and $Ti$ are purified by van Arkel method.
  • A
    $a$ and $b$
  • B
    $a$ and $c$
  • C
    $b$ and $c$
  • ✓
    $a$ and $d$
✓

Answer

Correct option: D.
$a$ and $d$
Cast iron is different from pig iron and is made by melting pig iron with scrap iron and coke using hot air blast. van Arkel method is used for the refining of $Zr$ and $Ti.$ The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatilizes:
$\text{Zr}+2\text{I}_{2} \rightarrow\text{ZrI}_{4}$
The metal iodide is decomposed on a tungsten filament, electrically heated to about $1800 K.$ The pure metal is thus deposited on the filament.
$\text{ZrI}_{4} \rightarrow\text{Zr}+2\text{I}_{2}$

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