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# $[Cr(H_2O)_5Cl]SO_4$ and $[Cr(H_2O)_5SO_4]Cl$ are

$\begin{array}{1 1}(a)\;\text{Ionisation isomers}\\(b)\;\text{Coordination isomers}\\(c)\;\text{linkage isomers}\\(d)\;\text{Hydrate isomers}\end{array}$

$[Cr(H_2O)_5Cl]SO_4$ and $[Cr(H_2O)_5SO_4]Cl$ are Coordination isomers
Hence (b) is the correct answer.