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When concentrated HCI is added to an...

When concentrated HCI is added to an aqueous solution of `CoCl_(2) ` . Its colour changes from reddish pink to deep blue . Which complex ion gives blue colour in this reaction ?

A

`[Co(H_(2)O)_(6)]^(2+)`

B

`[CoCI_(6)]^(3-)`

C

`[CoCI_(4)]^(2-)`

D

`[CoCI_(6)]^(4-)`

Text Solution

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

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  3. When concentrated HCI is added to an aqueous solution of CoCl(2...

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

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  5. Compound A,B and C are respectively:

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

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

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

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

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

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

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  19. Identify incorrect statement:

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