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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 CO2 are produced at the cathode.

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

The correct option is B (i) and (ii) only
(i) Copper is extracted by hydrometallurgy from low-grade ores. It is leached out using acid or bacteria. The solution containing Cu2+ is treated with scrap iron or H2.
Cu2+(aq)+H2(g)Cu(s)+2H+(aq)
(ii) In the electrolytic reduction of alumina. The graphite act as anode and steel with a lining of carbon acts as an anode.
(iii) The process of extracting Aluminium from Alumina (Al2O3) 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 CO2.

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