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Co-ordiantion compounds show structural ...

Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism.
1 . Aqueous solutions of `` on addition of excess of concentrated HCl turns blue due to the formation of

A

`[Co(H_(2)O)_(4)Cl_(2)]`

B

`[Co(H_(2)O)_(4)Cl_(4)]^(2-)`

C

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

D

`[Co(H_(2)O)_(2)Cl_(2)]`

Text Solution

Verified by Experts

The correct Answer is:
c
`CoCl_2` is a weak Lewis acid and takes up two `Cl^(-)` ions to form a salt `[CoCl_4]^(2-)` which is tetrahedral . In the anhydrous state, `CoCl_2` is violet and in solution the tetrahedral salt formed on reacting with HCl is blue in colour.
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Knowledge Check

  • Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. Which of the following will not show geometrical isomerism ?

    A
    `[Cr(NH_(3))_(4)Cl_(2)]Cl`
    B
    `[CoCl_(2)(en)_(2)]Cl`
    C
    `[Co(NH_(3))_(5)NO_(2)]Cl_(2)`
    D
    `[Pt(NH_(3))_(2).Cl_(2)]`

  • Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. One mole of the complex compound gives 3 mole of ions on dissolution in water. One mole of the same complex reacts with two moles of to yield two moles of . The structure of the complex is :

    A
    `[Co(NH_(3))_(3)Cl_(3)].2NH_(3)`
    B
    `[Co(NH_(3))_(4)Cl_(2).NH_(3)`
    C
    `[Co(NH_(3))_(4)Cl]Cl_(2).NH_(3)`
    D
    `[Co(NH_(3))_(5)Cl]Cl_(2)`

  • Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. Which one is the most likely structure of if 1/3 of the total chloride in the compound is precipitated by adding solution ?

    A
    `CrCl_(3).6H_(2)O`
    B
    `[Cr(H_(2)O)_(3)]Cl_(3)](H_(2)O)_(3)`
    C
    `[Cr(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O`
    D
    `[Cr(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`

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