25 Which of the following statement is incorrect a Hydrogen is used to reduce NiO b Zirconium is refined by van Arkel method c

Question

25 Which of the following statement is incorrect a Hydrogen is used to reduce NiO b Zirconium is refined by van Arkel method c The sulphide ore galena is concentrated by froth floatation d In the metallurgy of iron the flux used is SiO 2

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