Question

Which of the following statements is correct?
(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
(iii) In Hall-Heroult process, aluminium is obtained at anode and CO and $C{O}_2$ are produced at the cathode.

• A. (i) only
• B. (i) and (ii) only
• C. (ii) and (iii) only
• D. All of these

Answer 1

The correct option is B (i) and (ii) only

$\left(i\right)$ Copper is extracted by hydrometallurgy from low-grade ores. It is leached out using acid or bacteria. The solution containing $C{u}^{2+}$ is treated with scrap iron or $H_2$.

$C{u}^{2+}\left(aq\right)+H_2\left(g\right)⟶Cu\left(s\right)+2H^{+}\left(aq\right)$

$\left(ii\right)$ In the electrolytic reduction of alumina. The graphite act as anode and steel with a lining of carbon acts as an anode.

$\left(iii\right)$ The process of extracting Aluminium from Alumina $\left(A{l}_2{O}_3\right)$ by electrolysis is called Hall-Heroult process. In this process Aluminium is produced at cathode which is obtained by outlet, oxygen is released at an anode. It reacts with carbon of anode producing $CO$ and $C{O}_2$.