Refining using liquation method is the most suitable for metals with :
Low melting point
High boiling point
High electrical conductivity
Less tendency to be soluble in melts than impurities
Liquation process is used for metals having lesser melting point than impurities.
The metals melts and flows down to collector While impurities are left behind behind and later discarded.
This process is applied only when impurities are higher in concentration.
Hence, the correct answer is Option (1).
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