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Select correct pair of co-ordination compounds in which first complex compound/ion is more stable than second compound/ion.
\( P \)
(a) \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-},\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
(b) \( \left[\mathrm{PdBr}_{2}\left(\mathrm{NH}_{3}\right)_{2}\right],\left[\mathrm{PdBr}(\mathrm{ONO})\left(\mathrm{NH}_{3}\right)_{2}\right] \)
W.
(c) \( \left[\mathrm{Co}(\mathrm{SCN})_{4}\right]^{2-},\left[\mathrm{CoF}_{6}\right]^{3-} \)
(d) \( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{en})_{2}\right]^{3+},\left[\mathrm{Cr}(\mathrm{en})_{3}\right]^{3+} \)
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