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Pair of complexes, which do not have equal number of unpaired electron(s) ?
(a) \( \left[\mathrm{Co}(\mathrm{CO})_{4}\right]^{-},\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{4-} \)
(b) \( \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+},\left[\mathrm{NiF}_{6}\right]^{2-} \)
\( \mathrm{P} \)
(c) \( \left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{4-} \)
(d) \( \left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{4-},\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
W
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