|
The technique by which gold and silver are refined as |
|||
|
(a) |
electrolytic refining |
(b) |
vacuum melting |
|
(c) |
liquation process |
(d) |
zone refining |
|
The technique by which gold and silver are refined as |
|||
|
(a) |
electrolytic refining |
(b) |
vacuum melting |
|
(c) |
liquation process |
(d) |
zone refining |