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A co-ordination complex compound of coba...

A co-ordination complex compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution, on reacting with excess of `AgNO_3, AgCl` is precipitated. The ionic formula for this complex would be:

A

`[Co(NH_3)_5(NO_2)]Cl_2`

B

`[Co(NH_3)_5Cl]`

C

`[Co(NH_3)_4(NO_2)Cl]`

D

`[Co(NH_3)_5]`

Text Solution

Verified by Experts

The correct Answer is:
A
The most probable complex which gives three mole ions in aqueous solution may be `[Co(NH_3)_5)_5 NO_2]Cl_2`.
`[Co(NH_3)_5 (NO_2)]Cl_2 to [Co(NH_3)_5NO_2]^(2+) + 2Cl^(-)`
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When 0.1 mol of a cobalt complex is treated with excess of AgNO_(3) solution, 28.7g of AgCl is precipitated. The formula of the complex is

A and B are two isomeric complex compounds. Both contain central Co(3+) Ion with coordination number 6 and 5 NH_3 ligands. They also contain Cl and SO_4 groups. A gives a white precipitate with barium chloride solution while B gives a white precipitate with AgNO_3 solution:- Write down the formulae of A & B.

Knowledge Check

  • One mole of the complex compound Co(NH_3)_5Cl_3 gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO_3 solution to yield two moles of AgCl(s) . The structure of the complex is

    A
    `[Co(NH_3)_5Cl]Cl_2`
    B
    `[Co(NH_3)_3Cl_3]. 2NH_3`
    C
    `[Co((NH_3)_4Cl_2]Cl. NH_3`
    D
    `[Co(NH_3)_4Cl]Cl_2. NH_3`

  • One mole of the coinplex compound Co(NH_3)_5 Cl_3 gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO_3 solution to yield two moles of AgCl(s) . The structure of the complex is

    A
    `[Co(NH_3)_5, Cl]Cl_2`
    B
    `[Co(NH_3)_3 Cl_3] . 2NH_3`
    C
    `[Co(NH_3)_4 Cl_2]Cl. NH_3`
    D
    `[Co(NH_3)_4 Cl]Cl_2. NH_3`

  • One mole of complex compound 'Co(NH₃)₅Cl₃ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with 2 moles of AgNO₃ solution to yield 2 moles of AgCl .The structure of the complex is

    A
    [Co(NH₃)₃Cl₃] .2NH₃
    B
    [Co(NH₃)₄Cl₂] Cl.NH₃
    C
    Co(NH₃)₄ Cl] Cl₂NH₃
    D
    [Co(NH₃)₅ Cl] Cl₂

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