In the electrolysis of aluminium oxide,which of the following is added to accelerate the process?

Roasted copper pyrite on smelting with sand produces

Explain the electrolytic reduction of alumina.

In metallurgy,a flux is a substance that .....

Which statement is correct?

The compound$(s)$ that is(are) removed as slag during the extraction of copper is:
$1. CaO$
$2. FeO$
$3. Al_{2}O_{3}$
$4. ZnO$
$5. NiO$
Choose the correct answer from the options given below.