Coordination Compounds - Result Question 60
####67. Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (Atomic number: $Zn=30, Cr=24, Co=27$, $Ni=28)$
[2005]
(a) $[Zn(NH_3)_6]^{2+}$
(b) $[Cr(NH_3)_6]^{3+}$
(c) $[Co(NH_3)_6]^{3+}$
(d) $[Ni(NH_3)_6]^{2+}$
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Solution:
(c) $[Co(NH_3)_6]^{3+} Co^{3+}(27-3=24)$
$[Cr(NH_3)_6]^{3+} Cr^{3+}(24-3=21)$
$d^{2} s p^{3} \to$ (inner octahedral complex & paramagnetic)
$[Ni(NH_3)_6]^{2+} Ni^{2+}(28-2=26)$
$[Zn(NH_3)_6]^{2+} Zn^{2+}(30-2=28)$
