Medium
Which one of the following statements is incorrect?
- ABoron and Indium can be purified by zone refining method.
- BVan-Arkel method is used to purify tungsten.
- CCast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
- DThe malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
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