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In the separation of Cu^(2+) and Cd^(2+)...

In the separation of `Cu^(2+)` and `Cd^(2+)` of Iind group in qualitative analysis of cations, tetraamminecopper (II) sulphate and tetramminecadmium (II) sulphate react with KCN to form the corresponding cyano complex. Which one of the following pairs of the complexes and their relative stability enables the separation of `Cu^(2+)` and `Cd^(2+)` ?

A

`K_(3)[Cu(CN)_(4)]` more stable and `K_(2)[Cd(CN)_(4)]` less stable

B

`K_(2)[Cu(CN)_(4)]` less stable and `K_(2)[Cd(CN)_(4)]` more stable

C

`K_(2)[Cu(CN)_(4)]` more stable and `K_(2)[Cd(CN)_(4)]` less stable

D

`K_(3)[Cu(CN)_(4)]` less stable and `K_(2)[Cd(CN)_(4)]` more stable.

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NARAYNA-QUALITATIVE ANALYSIS-Level -II (H.W.)
  1. Which is not dissolved in dil. HCl?

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  2. Which one among the following pairs of ions cannot be separated by H(2...

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  3. In the separation of Cu^(2+) and Cd^(2+) of Iind group in qualitative ...

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  4. Which of the following sulphate is insoluble in water ?

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  5. Passing H(2)S gas into a mixture of Mn^(2+), Ni^(2+), Cu^(2+) and Hg^(...

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  6. An aqueous solution of a substance gives a white precipitate on treat...

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  7. When H(2)S gas is passed through an ammonical salt solution X, a sligh...

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  8. MgSO(4) on reaction with NH(4)OH and Na(2)HPO(4) forms a white crystal...

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  9. When dimethyl glyoxime solution is added to an aqueous solution of nic...

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  10. Aqueous solution of A gives yellow precipitate with aqueous solution o...

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  11. The sulphides of which one of the following groups of elements are sol...

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  12. NiS is separated from ZnS by treating with

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  13. Mercurous chloride black on adding NH(4)OH to it. Explain.

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  14. Which of the following sulphides is yellow in colour?

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  15. An orange precipitate in the second group is given by

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  16. An aqueous solution containing Hg^(2+),Hg(2)^(2+),Pb^(2+) and Cd^(2+) ...

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  17. Upon treatment with ammonical H(2)s, the metal ion that precipitates a...

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  18. Calomel (Hg(2)Cl(2)) on reaction with ammonium hydroxide gives

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  19. A sulphate of a metal (A) on heating evolves two gases (B) and ( C) an...

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  20. Which of the following pairs is not distinguished by passing H(2)S ?

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