Which substance is used to provide a basic lining in a furnace?

Highly electropositive metals cannot be commercially extracted by the carbon reduction process at high temperatures because these

Blisters on copper are produced due to the evolution of which gas?

In the extraction of copper from copper pyrites,iron is removed as

Which of the following is an acidic flux?

In the process of extraction of gold,roasted gold ore reacts as follows. Identify the complexes $[X]$ and $[Y]$:
$\text{Roasted gold ore} + CN^{-} + H_2O \xrightarrow{O_2} [X] + OH^{-}$
$[X] + Zn \to [Y] + Au$