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Among the following pair of complexes, in which case the value of \( \Delta_{0} \) is higher for the first
P one?
(a) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \) and \( \left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-} \)
(b) \( \left[\mathrm{CoF}_{6}\right]^{3-} \) and \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
W
(c) \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \) and \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \)
(d) \( \left[\mathrm{Rh}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \) and \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \)
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