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Question
Which is low spin complex?
Options
\[\ce{Fe(CN)^{4-}_6}\]
\[\ce{Co(NO2)^{3-}_6}\]
\[\ce{Mn(CN)^{3-}_6}\]
All of these
MCQ
Fill in the Blanks
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Solution
All of these.
Explanation:
| Fe(26) |      |
|
| 3d | 4s | |
| Fe+2 | |
CN- is strong field ligand, it pair the electron and form a low spin complex.
| Co(27) | |
|
| 3d | 4s | |
| Co+3 | |
|
| 3d | 4s |
`"NO"_2^-` is able to cause the pair pairing of electrons, so a low spin complex will form.
| Mn(25) | |
|
| 3d | 4s | |
| Mn+3 | |
|
| 3d | 4s |
CN- strong field ligand, causes the pairing of electron.
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