In quantitative analysis of second group in laboratory H2S gas is passed in acidic medium for precipitation.
In quantitative analysis of second group in laboratory H2S gas is passed in acidic medium for precipitation. When Cu2+ and Cd2+ react with KCN, then for product, true statement is
(a) K2[Cu(CN)4] more soluble
(b) K2[Cd(CN)4] less stable
(c) K3[Cu(CN)2] less stable
(d) K2[Cd(CN)3] more stable.
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The correct option is : (c) K3[Cu(CN)2] less stable
Explanation :
K3[Cu(CN)2] = 3(+1) + x + 2(-1) = 0
=> x = -1
As the oxidation no. of 'cu' is -1(-ve), so this complex is unstable and is not formed.
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