Chemistry - Metallurgy Question with Solution | TestHub

The incorrect statement is C. In Serpeck's process, ammonia (NH₃) gas is evolved, which reacts with HCl to form white fumes of NH₄Cl, not brown fumes. Brown fumes are typically associated with nitrogen dioxide (NO₂).

A. Correct. Silica (flux) reacts with FeO (impurity) to form ferrous silicate (slag) in copper extraction.

B. Correct. In hydrometallurgy of Ag, zinc acts as a reducing agent to precipitate silver.

D. Correct. Thomas slag (calcium phosphate) is formed in the Bessemer converter during the removal of phosphorus impurities from iron.