1. Tardigrade
  2. Question
  3. Chemistry
  4. A coordination 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 this solution with excess of AgNO 3 solution, we get two moles of AgCl precipitate. The ionic formula for this complex would be

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Q. A coordination 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 this solution with excess of $AgNO _{3}$ solution, we get two moles of $AgCl$ precipitate. The ionic formula for this complex would be

AIPMTAIPMT 1998Coordination Compounds

Solution:

The crux lies in the fact that on treating with $AgNO _{3}$ solution two moles of $AgCl$ precipitated indicating that both the chloride ions are present outside the coordination sphere
The most probable complex which gives three moles ions in aqueous solution may be $\left[ Co \left( NH _{3}\right)_{5}\left( NO _{2}\right)\right] Cl _{2}$ because it gives two chlorine atoms on ionisation.
$\left[ Co \left( NH _{3}\right)_{5}\left( NO _{2}\right)\right] Cl _{2} \rightarrow\left[ Co \left( NH _{3}\right)_{5}\left( NO _{2}\right)\right]^{2+}+2 Cl ^{-}$