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A co-ordination complex compound of cobalt has the molecular formulae 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  precipitate. The ionic formula for this complex would be:

  • Option 1)

    [Co(NH_3)_5(NO_2)]Cl_2\;

  • Option 2)

    \; \; [Co(NH_3)_5Cl][Cl(NO_2)]\;

  • Option 3)

    \; [Co(NH_3)_4(NO_2)Cl][(NH_3)Cl]\;

  • Option 4)

    \; [Co(NH_3)_5][(NO_2)_2Cl_2]

 

Answers (1)

best_answer

As we learnd

 

 

Stability of Complex -

Stability of complex is depends on nature of ligands, size of central atom and stability concept.

- wherein

Stability \alpha Stability Constant

 

The most probable complex which gives three moles ions in aqueous solution may be [Co(NH_3)_5NO_2]Cl_2  because it gives two chlorine atoms on ionisation.

[Co(NH_3)_5NO_2]Cl_2\rightarrow [Co(NH_3)_5NO_2]^{2+}+2Cl^{-}


Option 1)

[Co(NH_3)_5(NO_2)]Cl_2\;

Option 2)

\; \; [Co(NH_3)_5Cl][Cl(NO_2)]\;

Option 3)

\; [Co(NH_3)_4(NO_2)Cl][(NH_3)Cl]\;

Option 4)

\; [Co(NH_3)_5][(NO_2)_2Cl_2]

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