The incorrect statement among the following is

Options

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`

Answer

D

Explanation

CaO acts as a flux as it combines with silica present as an impurity (gangue) to form a fusible slag,`CaSiO_(3)`