# Which of these statements about [Co(CN)6]3- is true? Option 1) [Co(CN)6]3 - has four unpaired electrons and will be in a high-spin configuration. Option 2) [Co(CN)6]3 - has no unpaired electrons and will be in a high-spin configuration. Option 3) [Co(CN)6]3 - has no unpaired electrons and will be in a low-spin configuration. Option 4) [Co(CN)6]3 - has four unpaired electrons and will be in a low-spin configuration.

As we discussed in the concept

Inner sphere complex -

Complexes in which (n-1)d orbitals are used in hyberdisation.

- wherein

For example: $d^{2} sp^{3} hybrid \left [ Fe\left ( CN \right )_{6} \right ]$

Strong Field Ligand -

These are the ligands which pair the electron in inner d-orbital and makes required d-orbitals empty/available.

- wherein

For example: CO, CN etc

$CN^-$  is a strong field ligand which pairs the all unpaired electrons of $Co^{3+}\: in\:[Co(CN)_6]^{3-}$ which results no unpaired electron in the $Co^{3+}$ and it form low spin complex.

Option 1)

[Co(CN)6]3 - has four unpaired electrons and will be in a high-spin configuration.

Incorrect

Option 2)

[Co(CN)6]3 - has no unpaired electrons and will be in a high-spin configuration.

Incorrect

Option 3)

[Co(CN)6]3 - has no unpaired electrons and will be in a low-spin configuration.

Correct

Option 4)

[Co(CN)6]3 - has four unpaired electrons and will be in a low-spin configuration.

Incorrect

### Preparation Products

##### Rank Booster NEET 2021

This course will help student to be better prepared and study in the right direction for NEET..

₹ 13999/- ₹ 9999/-
##### Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-
##### Knockout NEET May 2022

An exhaustive E-learning program for the complete preparation of NEET..

₹ 34999/- ₹ 24999/-
##### Test Series NEET May 2021

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 6999/- ₹ 4999/-