RRB Group-D Model Paper 19 with answers for online practice

Explanation:

• Gold and silver ores are concentrated by leaching.
• In the leaching method, the ore is treated with a suitable reagent in which ore is soluble but impurities do not. Thus, impurities are removed by filtration.
• Among galena (PbS), copper pyrites (CuFeS2), cinnabar (HgS) and argentite (Ag2S) argentite being silver ore is concentrated by chemical leaching method.

So, Leaching method is suitable for the concentration of the argentite.