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Which one of the following statements is...

Which one of the following statements is incorrect ?

A

van Arkel method is used to purify tungsten

B

The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace

C

Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.

D

Boron and Indium can be purified by zone refining method.

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The correct Answer is:
A
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