First slide

Aplicaitons of VBT

Question

Which one of the following is an inner orbital complex as well as diamagnetic in nature?

Easy

A

${[Co {({NH}_{3})}_{6}]}^{3 +}$
B

${[Cr {({NH}_{3})}_{6}]}^{3 +}$
C

${[Ni {({NH}_{3})}_{6}]}^{2 +}$
D

${[Zn {({NH}_{3})}_{6}]}^{2 +}$

Solution

In ${[ZN {({NH}_{3})}_{6}]}^{2 +}$ , Zn exists as Zn²⁺
$_{30} Zn : 3 d^{10}, 4 s^{2}$
Zn²⁺: 3d¹⁰ ; Thus, no unpaired electron but it is outer orbital complex.
In [Co(NH₃)₆]³⁺, Co exists as Co³⁺
₂₇Co: 3d⁷, 4s²
Co³⁺: 3d⁶; It is d²sp³ hybridized, inner orbital complex with 3 electron paired in 3d.

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