Which one of the following statements is incorrect?

<p><strong style="color: rgb(230, 0, 0);">Option A</strong>: Cast iron is obtained by melting pig iron (crude iron) with scrap iron and coke (a fuel made from coal) using a hot air blast. The resulting molten metal is poured into molds to form cast iron products.</p><p><strong style="color: rgb(230, 0, 0);">Option B</strong>: Wrought Iron or Malleable iron is produced from cast iron by heating it in a reverberatory furnace lined with Haematite, which removes impurities through oxidation. The resulting product is malleable iron, which is a type of iron that can be shaped and molded.</p> <p><strong style="color: rgb(230, 0, 0);">Option C</strong>: van Arkel Method for Refining Zirconium or Titanium: This method is very useful for removing all the oxygen and nitrogen present in the form of impurity in certain metals like $\mathrm{Zr}$ and Ti. The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatilises:</p> <p>$\mathrm{Zr}+2 \mathrm{I}_2 \rightarrow \mathrm{ZrI}_4$</p> <p>The metal iodide is decomposed on a tungsten filament, electrically heated to about $1800 \mathrm{~K}$. The pure metal deposits on the filament.</p> <p>$\mathrm{ZrI}_4 \rightarrow \mathrm{Zr}+2 \mathrm{I}_2$</p> <p><strong style="color: rgb(230, 0, 0);">Option D</strong>: Zone refining is a method used to purify certain metals such as boron, indium, germanium, silicon, and galium. It involves heating the metal to a liquid state and then slowly moving it along a column to allow impurities to migrate to one end of the column, where they can be removed.</p>