Which of these statements about [ Co(CN) _6]^ 3- is true:-

NEET 2015 Chemistry question

Which of these statements about is true:-

(1) has four unpaired electrons and will be in a low-spin configuration.
(2) has four unpaired electrons and will be in a high spin configuration.
(3) has no unpaired electrons and will be in a high-spin configurtion.
(4) has no unpaired electrons and will be in a low-spin configuration.Correct

Answer: (4)

Solution

In cobalt is in the +3 state: . CN is a strong-field ligand, so exceeds the pairing energy and all six d electrons pair up in the orbitals (). There are therefore no unpaired electrons (diamagnetic) and the complex is low spin

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Question ID VK-091694