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Leaching of Ag2S is carried out by heating it with a dilute solution of:

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a

NaCN only

b

HCl

c

NaOH

d

NaCN in presence of O2

answer is D.

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Detailed Solution

Ag2S(conc. ore)+2NaCN⇌Air2AgCN+Na2SAg2S and AgCN are in equilibrium so Na2S is oxidised by air in to Na2SO4. Hence equilibrium shifts towards right side. 4Na2S+5O2+2H2O→2Na2SO4+4NaOH+2SAgCN+NaCN→Na[Ag(CN)2] (soluble complex) 2Na[Ag(CN)2]+Zn(dust)→2Ag+Na2[Zn(CN)4]

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