KCET · Chemistry · Coordination Compounds

The complex compounds \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}\) and \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4\) are

A coordination isomers
B geometrical isomers
C optical isomers
D ionisation isomers

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Answer & Solution

Correct Answer

(D) ionisation isomers

Step-by-step Solution

Detailed explanation

The complex \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}\) and \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4\) are ionisation isomers of each other.
- This form of isomerism arises when the counter ion in a complex salt is itself a potential ligands and can displace a ligand which can then become the counter ion.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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