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In which of the following pairs both the complexes show optical isomerism?
\( \mathrm{P} \)
(a) cis- \( \left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{2} \mathrm{Cl}_{2}\right]^{3-} \), cis- \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right] \)
W
(b) \( \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3} \), cis- \( \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl} \)
(c) \( [\mathrm{Pt} \mathrm{Cl}(\mathrm{en}) \mathrm{Cl}],\left[\mathrm{NiCl}_{2} \mathrm{Br}_{2}\right]^{2-} \)
(d) \( \left[\mathrm{Co}\left(\mathrm{NO}_{3}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right] \), cis-[Pt(en \( \left.)_{2} \mathrm{Cl}_{2}\right] \)
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