Question

Refining of Silver is done by _________

• A. Poling
• B. Cupellation
• C. Liquation
• D. Van Artikel Method.

Answer 1

The correct option is B

Cupellation

Explanation for the correct answer:-

Option (B) Cupellation

• Cupellation is a refining process, and it is used to separate the noble metals like gold, silver, etc. from the base metals for example, for example, led, copper, zinc, or the alloyed metals.
• In this process, under high pressure the noble metals are separated from the base metals by treating the ores.
• Thus in a similar fashion the refining of silver is done by using this cupellation method.
• Hence it is the correct option.

Explanation for the incorrect answer:-

Option (A) Poling

• It is a metallurgical process which is used in the purification copper containing Copper oxide as its impurities and tin containing Tin oxide$\left({\mathrm{SnO}}_2\right)$as its impurities.
• Thus it is not used in the case of silver.
• Hence it is the incorrect option.

Option (A) Liquidation

• It is a metallurgical process that is used for the separation of metal from their ores.
• In this process, the silver rich copper is melted with approximately three times its weight in lead.
• Now since silver has a greater affinity towards lead, so most of the silver ends up within this rather than the copper.
• Hence it is the incorrect option.

Option (D) Van Artikel Method.

• Van Artikel Method is used only in the case of refining of Zirconium and Titanium.
• Oxygen and Nitrogen are the impurities that are removed in this process.
• Hence it is the incorrect option.

Therefore, Refining of Silver is done by Cupellation