Which of the following pairs of complexes are isomeric with each other but their aqueous solutions exhibit different molar conductivities?

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$[Co ({NO}_{2}) {({NH}_{3})}_{5}] {Cl}_{2} and [Co (ONO) {({NH}_{3})}_{5}] Cl$

$[CoBr {({NH}_{3})}_{5}] {SO}_{4} and [Co ({SO}_{4}) {({NH}_{3})}_{5}] Br$

$[{CoCl}_{2} {({NH}_{3})}_{4}] {NO}_{2} and [CoCl ({NO}_{2}) {({NH}_{3})}_{4}] Cl$

$[{PtCl}_{2} {({NH}_{3})}_{4}] {Br}_{2} and [{PtBr}_{2} {({NH}_{3})}_{4}] {Cl}_{2}$

answer is D.

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Detailed Solution

[CoBr(NH₃)₅]SO₄ and [Co(SO₄)(NH₃)₅]Br are ionization isomers.
They will give different ions in the solution.
[CoBr(NH₃)₅]SO₄⇌ [CoBr(NH₃)₅]²⁺+ ${SO}_{4}^{2 -}$
[Co(SO₄)(NH₃)₅]Br ⇌ [Co(SO₄)(NH₃)₅]⁺+ Br⁻
Thus, total charges obtained by the ionization of one molecule each of [CoBr(NH₃)₅]SO₄ and [Co(SO₄)(NH₃)₅]Br are 4 and 2 respectively.
Hence, their aqueous solutions exhibit different molar conductivities.