The number of unpaired electrons in the complex ion [CoF_6]^ 3- is: (Atomic no. : Co=27 )

Correct answer: C. 4 (Co(Z= 27)) has observed electronic configuration ([Ar] 3 d^ 7 4 s^ 2. Co^ 3+ ) has electronic configuration ([Ar] 3 d^ 6 4 s^ 0 ·[CoF _ 6 ]^ 3- ) is a high spin complex and contains 4 unpaired electrons.

NEET 2003

Exam: NEET
Year: 2003
Subject: Chemistry
Chapter: Coordination Compounds

NEET 2003 · Chemistry · Coordination Compounds

The number of unpaired electrons in the complex ion [CoF_6]^ 3- is:...

The number of unpaired electrons in the complex ion

\left[\mathrm{CoF}_6\right]^{3-}

is: (Atomic no. :

\mathrm{Co}=27

)

Options

A2
B3
C4
DZero

Correct answer

C. 4

Step-by-step solution

(\mathrm{Co}(\mathrm{Z}=

27)) has observed electronic configuration ([\mathrm{Ar}]

\mathrm{ d}^

7 4

\mathrm{ s}^

\mathrm{Co}^{3+}

) has electronic configuration ([\mathrm{Ar}]

3

\mathrm{ d}^

6 4

\mathrm{ s}^

0

\cdot\left[\mathrm{CoF}}_{6}\right]^{3-}) is a high spin complex and contains 4 unpaired electrons.

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