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Which of the following pairs of complexes are isomeric with each other but their aqueous solutions exhibit different molar conductivities?
P
(a) \( \left[\mathrm{PtCl}_{2}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Br}_{2} \) and \( \left[\mathrm{PtBr}_{2}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2} \)
(b) \( \left[\mathrm{CoCl}_{2}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{NO}_{2} \) and \( \left[\mathrm{CoCl}\left(\mathrm{NO}_{2}\right)\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl} \)
W
(c) \( \left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)\left(\mathrm{NH}_{3}\right)_{5}\right] \mathrm{Cl}_{2} \) and \( \left[\mathrm{Co}(\mathrm{ONO})\left(\mathrm{NH}_{3}\right)_{5}\right] \mathrm{Cl}_{2} \)
(d) \( \left[\mathrm{CoBr}\left(\mathrm{NH}_{3}\right)_{5}\right] \mathrm{SO}_{4} \) and \( \left[\mathrm{Co}\left(\mathrm{SO}_{4}\right)\left(\mathrm{NH}_{3}\right)_{5}\right] \mathrm{Br} \)
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