A) Square planar complexes are more stable than octahedral complexes.
B) \[{{[CO{{(N{{H}_{3}})}_{6}}]}^{2+}}\] is oxidized to diamagnetic \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\] by the oxygen in air.
C) The\[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] ion has a tetrahedral geometry and is diamagnetic.
D) \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]is stable but\[{{[Fe{{F}_{6}}]}^{3-}}\] is unstable.
Correct Answer: B
Solution :
In\[{{[Co{{(N{{H}_{3}})}_{6}}]}^{2+}}\,Co\]has +2 charge and \[3{{d}^{7}}\] state it means it has 2 unpaired \[{{e}^{-}}\]on oxidant in\[C{{O}^{3+}}\]configuration changes into \[3{{d}^{6}}\]where unpaired\[{{e}^{-}}\]is not present, so it is diamagnetic. Hence, the correct option is [b].
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