A) hydrogen is used to reduce \[\text{NiO}\]
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 \[\text{Si}{{\text{O}}_{2}}\]
Correct Answer: D
Solution :
The gangue \[\text{(Si}{{\text{O}}_{2}}\text{)}\] obtained in the metallurgy of iron, is acidic in nature, thus a basic flux like CaO (lime) is used to remove it. \[\underset{\text{flux}}{\mathop{CaO}}\,\,+\underset{\text{gangue}}{\mathop{Si{{O}_{2}}}}\,\xrightarrow{{}}\underset{\text{slag}}{\mathop{CaSi{{O}_{3}}}}\,\]
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