Extraction of Metals - Result Question 25

####25. Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

(a) nitrogen

(b) oxygen

(c) carbon dioxide

(d) argon

(2008,3M)

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Solution:

  1. A water soluble complex with silver and dilute aqueous solution of NaCN is Na[Ag(CN)2]. In the cyanide process, the native silver is crushed and treated with aqueous NaCN solution and aerated.

4Ag+8NaCN+2H2O+O24Na[Ag(CN)2]

+4NaOH



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