Which of the following statement is incorrect? (a) Hydrogen is used to reduce \( \mathrm{NiO} \)...

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Which of the following statement is incorrect?
(a) Hydrogen is used to reduce \( \mathrm{NiO} \)
P
(b) Zirconium is refined by van Arkel method
W.
(c) The sulphide ore galena is concentrated by froth floatation
(d) In the metallurgy of iron, the flux used is \( \mathrm{SiO}_{2} \)
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