The dand fblock elements - Result Question 69
####69. While extracting an element from its ore, the ore is ground and leached with dil. potassium cyanide solution to form the soluble product potassium argento cyanide. The element is
[1989]
(a) Lead
(b) Chromium
(c) Manganese
(d) Silver
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Solution:
- (d) Cyanide process is used in the metallurgy of Ag.
$2 Ag_2 S+8 NaCN+O_2+2 H_2 O \longrightarrow$ $4 Na[Ag(CN)_2]+4 NaOH+2 S$
$2 Na[Ag(CN)_2]+Zn \longrightarrow$
$ Na_2[Zn(CN)_4]+2 Ag \downarrow $
