The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
Boron and Indium can be purified by zone refining method.
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The Correct Option isA
Solution and Explanation
To determine the incorrect statement from the given options, let's analyze each one:
van Arkel method is used to purify tungsten.
This statement is incorrect. The van Arkel method is primarily used for the purification of metals like titanium and zirconium, not tungsten. This method involves the thermal decomposition of metal iodides to purify these metals due to their high reactivity with iodine.
The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
This statement is correct. Malleable iron is indeed produced from cast iron through a process involving oxidation, where the brittle cementite in cast iron is converted to more malleable ferrite.
Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
This statement is correct. Cast iron is manufactured by melting pig iron, along with some scrap iron and coke, in a furnace, typically the cupola furnace, with a hot air blast.
Boron and Indium can be purified by zone refining method.
This statement is correct. Zone refining is a purification technique used primarily for semiconductors such as silicon and germanium, but it can indeed be used to purify boron and indium by exploiting the differences in their melting points and impurities.
Hence, the correct answer is: "van Arkel method is used to purify tungsten."
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