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Coordination Compounds question

2000 · Q84
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Coordination Compounds question

2000 · Q84

NEETChemistryCoordination CompoundsMCQ+4 / −1
In quantitative analysis of second group in laboratory, H2S gas is passed in acidic medium for precipitation. When Cu2+ react with KCN, then for product, true statement is
  1. A
    K2[Cu(CN)4] more soluble
  2. B
    K2[Cd(CN)4] less stable
  3. C
    K2[Cu(CN)2] less stable
  4. D
    K2[Cd(CN)3] more stable
View written solutionFree

Correct answer: C

K3[Cu(CN)2] = 3(+1)+x+2(-1) = 0

⇒\Rightarrow⇒ x = -1

∴\therefore∴ the oxidation no. of 'Cu' is -1 (-ve), so this complex is unstable so it is not formed.

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