A) hydrogen is used to reduce\[NiO\]
B) zirconium is refined by van-Arkel method
C) the sulphide ore galena is concentrated by hydraulic washing process
D) in the metallurgy of iron, the flux used is \[Si{{O}_{2}}\]
Correct Answer: D
Solution :
The gangue\[(Si{{O}_{2}})\]obtained in the metallurgy of iron, is acidic in nature, thus a basic flux like \[CaO\](lime) is used to remove it. \[\underset{flux}{\mathop{CaO}}\,+\underset{gangue}{\mathop{Si{{O}_{2}}}}\,\xrightarrow{{}}\underset{slag}{\mathop{Casi{{O}_{3}}}}\,\]
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