Question

Match List I with List II and select the correct answer using the codes given below the list : -

$\begin{array}{cc}\text{List - I}& \text{List - II}\\ \text{(Metals)}& (\text{Extraction Process)}\\ \text{(a)}Au& \left(1\right)\text{Self reduction}\\ \text{(b)}Al& \left(2\right)\text{Liquation}\\ \text{(c)}Pb& \left(3\right)\text{Electrolysis}\\ \text{(d)}Sn& \left(4\right)\text{Bayer process}\end{array}$

Answer 1

Bayer process is one of the most industrially important processes to obtain pure aluminium oxide from the ore bauxite.
Liquation is used for easily fusible metals like Sn.
Self reduction is used generally for sulphide ores of less electropositive metals like Pb ,Cu and Hg.
Electrolysis is the most common for purification of gold.