Pick the correct statements from the following:

(i) Copper is recovered from low-grade ores using hydrometallurgy.

(ii) Graphite serves as an anode in the electrolytic reduction of alumina, while a steel tank lined with carbon serves as an anode.

(iii) The Hall-Heroult method produces aluminium at the anode and CO and CO2 at the cathode.

(i) Low-grade ores are processed using hydrometallurgy to extract copper. It is removed by leaching with acid or bacteria. Scrap iron or H₂ are used to treat the Cu²⁺ solution.

(ii) When reducing alumina electrolytically. Graphite serves as an anode, and steel with a carbon liner serves as an anode.

(iii) The Hall-Heroult process is a method for electrolytically separating aluminium from alumina (Al₂O₃). In this process, oxygen is released at an anode while aluminium is created at a cathode via an outlet. It interacts with the anode's carbon, generating CO and CO₂.