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Question: Answered & Verified by Expert
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 with excess of $\mathrm{AgNO}_{3}, \mathrm{AgCl}$ is precipitated. The ionic formula for this complex would be:
ChemistryCoordination CompoundsVITEEEVITEEE 2019
Options:
  • A $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right)\right] \mathrm{Cl}_{2}$
  • B $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right]\left[\mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]$
  • C $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{NO}_{2}\right) \mathrm{Cl}\right]\left[\left(\mathrm{NH}_{3}\right) \mathrm{Cl}\right]$
  • D $\left.\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\right]\left[\mathrm{NO}_{2}\right)_{2} \mathrm{Cl}_{2}\right]$
Solution:
1977 Upvotes Verified Answer
The correct answer is: $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right)\right] \mathrm{Cl}_{2}$
The most probable complex which gives three mole ions in aqueous solution may be $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}\right] \mathrm{Cl}_{2}$.

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