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An aqueous pink solution of cobalt (II) ...

An aqueous pink solution of cobalt (II) chloride changes to deep blue on addition of excess of `HCl`. This is because ....... .

A

`[Co(H_(2)O_(6)]^(2+)` is transformed into `[CoCl_(6)]^(4-)`

B

`[Co(H_(2)O)_(6)]^(2+)` is transformed into `[CoCl_(4)]^(2-)`

C

tetrahedral complexes have smaller crystal field splitting than octahedral complexes

D

Tetrahedral complexes have larger crystal field splitting than octahedral complex

Text Solution

Verified by Experts

The correct Answer is:
B, C
Aqueous pink solution of cobalt (II) chloride is due to electronic transition of electron from `t_(2g)` to `e_(g)` energy level of `[Co(H_(2)O)_(6)]^(2+)` complex. When excess of HCl is added to this solution
(i) `[Co(H_(2)O)_(6)]^(2+)` is transformed into `[CoCl_(4)]^(2-)`.
(ii) Tetrahedral complexes have smaler crystal field splitting than octahedral complexes because `Delta_(t)=4/9 Delta_(0)`
Hence , option (b) and (c) are correct choices.
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Knowledge Check

  • An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCI. This is because …………… .

    A
    `[Co(H_(2)O)_(6)]^(2+)` is transformed into `[CoCl_(6)]^(4-)`
    B
    `[Co(H_(2)O)_(6)]^(2+)` is transformed into `[CoCl_(4)]^(2-)`
    C
    tetrahedral complexes have samaller crystal field splitting than octahedral complexes
    D
    tetrahedral complexes have larger cystal field splitting than octahedral complex.

  • Colour of cobalt chloride solution is

    A
    Pink
    B
    Black
    C
    Colourless
    D
    Green

  • Colour of cobalt chloride solution is:

    A
    pink
    B
    black
    C
    colourless
    D
    green

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    Why are all aqueous solution of the cobaltous salts pink?

    A metal chloride (X) shows the following reactions : (i) When H_(2)S is passed in acidified aqueous solution of (X) a black ppt. is obtained. (ii) The ppt. obtained in step (i) is not soluble in yellow ammonium sulphide. (iii) When a solution of stannous chloride is added to an aqueous solution of X, a white ppt. is obtained which turns grey on addition of more stannous chloride. (iv) When an aqueous solution of KI is added to an aqueous solution of (X) a red ppt. is obtained which dissolved on addition of excess of KI. Identify X and write down equation for the reactions at step (i), (ii), (iii) & (iv).

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