How many d-elecrons does the metal ion have in the complex ion [Mn(CN) 6 ] 3- ?
ID: 717401 • Letter: H
Question
How many d-elecrons does the metal ion have in the complex ion [Mn(CN)6]3-? Assuming that the ion is low spin, how many unpaired electrons does it have?
It has 2 electrons and 0 unpaired electrons
It has 4 electrons and 2 unpaired electrons
It has 2 electrons and 2 unpaired electrons
It has 4 electrons and 4 unpaired electrons
a.It has 2 electrons and 0 unpaired electrons
b.It has 4 electrons and 2 unpaired electrons
c.It has 2 electrons and 2 unpaired electrons
d.It has 4 electrons and 4 unpaired electrons
Explanation / Answer
The charge on the metal ion is +3
The outer electron configuration is 4s03d44p0
CN6 needs 6 orbitals but only 5 are available one S , one d as remaining four are filled with 1 electron each and 3 p orbitals. As CN is strong ligand it will make one electron in d orbital topair with another and get one more vacant d orbital ending with 2 unpaired electrons.
So d-orbital has total 4 electrons out of which 2 unpaired electrons and 2 pairedelectrons.
Option b is the right answer
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