Question

$\left[Co\right(N{H}_3{)}_{5}S{O}_4]Br$ and $\left[Co\right(N{H}_3{)}_{5}Br]S{O}_4$ show which type of isomerism?

• A. Coordination
• B. Ionization
• C. Linkage
• D. none of these

Answer 1

Answer: (B)

Ionization

Ionization Isomerism:The isomers which form different ions in solution, although, they have same the composition, are called ionization isomers.
For example, pentaamminebromocobalt (III) sulfate, $\left[CoBr\right(N{H}_3{)}_5]S{O}_4$ & pentaamminesulfatocobalt(III) bromide, $\left[Co\right(S{O}_4\left)\right(N{H}_3{)}_5]Br$
In the former, the bromide ion is coordinated to the $C{o}^{3+}$ ion and the sulfate ion is outside the coordination sphere; in the latter the sulfate ion occurs within the coordination sphere, and the bromide ion is outside it.
Hence option B is correct.