####44. The complex ion which has no ’ $d$ ‘-electrons in the central metal atom is
$(2001,1 M)$
(a) $\left[MnO _4\right]$
(b) $\left[Co\left(NH _3\right) _6\right]^{3+}$
(c) $\left[Fe(CN) _6\right]^{3-}$
(d) $\left[Cr\left(H _2 O\right) _6\right]^{3+}$
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