Chemistry - Metallurgy Question with Solution | TestHub

In metallurgy, sulphides (MxS) are thermodynamically more stable than oxides (MxO).

Due to this higher stability, reduction of sulphides is more difficult than oxides.

Hence sulphide ores are first converted into oxides by roasting before reduction.

Statement (B) is incorrect because cryolite is Na₃AlF₆ but it acts as solvent, not main electrolyte alone.

Statement (C) is wrong as graphite is used as anode, not cathode.