Question

Name the chief ore of silver describe with chemical equations the extraction of silver from the score

Answer 1

Argentite, which is a sulphide ore, is the chief source of silver. It is extracted by the process of leaching with a dilute solution of sodium cyanide.
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Answer 2

The chief ore of silver used in the extraction of silver is argentite $Ag_2S$

Explanation:

$NaCN$ is used to extract precious metals like silver and gold by converting these metals or their ores into their soluble complexes by the process called as leaching.

In this process, the finely powdered argentite $Ag_2S$ or silver is treated with a dilute solution of sodium cyanide while a current of air is continuously passed. As a result, silver get oxidized which then combine with $CN^-$ ion forming their respective soluble complex cyanides while the impurities remain unaffected which are filtered off.

$4Ag+8NaCN+2H_2O+O_2\rightarrow 4Na[Ag(CN)_2](soluble complex)+4NaOH$

The complex combines with zinc dust and forms sodium tetra cyanozicate and precipitated silver.

$Zn+2Na[Ag(CN)_2]\rightarrow Na_2[Zn(CN)_4]+2Ag$

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