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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_(3)[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

Text Solution

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The correct Answer is:
A
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GRB PUBLICATION-SALT ANALYSIS-H: IInd Group Cations
  1. Chocolate brown precipitate is formed with:

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  2. When concentrated HCI is added to an aqueous solution of CoCl(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. Compound A,B and C are respectively:

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  5. Sometimes yellow turbidity appears while passing H(2)S gas even in sli...

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  6. H(2)S in the presence of HCl precipitates II group but not IV group be...

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  7. Yellow ammonium sulphate solution is a suitable reagent for the separa...

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  8. In which of the following pairs the precipitates are red and black col...

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  9. Which one of the following salts will produce clear and transparant or...

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  10. A metal chloride original solution (i.e, O.S) on mixing with K(2)CrO(4...

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  11. Which of the following in insoluble in dil. HNO(3) but dissolves in aq...

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  12. When small amount of SnCl(2) is added to a solution of Hg^(2+) ions, a...

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  13. Which of the following reagents gives white precipitate with Hg(NO(3))...

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  14. When excess of dilute NH(4)OH is added to an aqueous solution of coppe...

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  15. A black sulphide is formed by the action of H(2)S on:

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  16. When bismuth chloride is poured into a large volume of water the white...

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  17. On passing H2 S gas in II group sometimes the solution turns milky. It...

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  18. Identify incorrect statement:

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  19. Copper wire test for halogens is known as:

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  20. When excess of SnCl2 is added to a solution of HgCl2, a white precipit...

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