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Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised - CBSE (Science) Class 12 - Chemistry

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Question

How would you account for the following:

Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

Solution

Co(II) is stable in aqueous solutions. However, in the presence of strong field complexing reagents, it is oxidized to Co (III). Although the 3rd ionization energy for Co is high, but the higher amount of crystal field stabilization energy (CFSE) released in the presence of strong field ligands overcomes this ionization energy.

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 8: The d-block and f-block Elements
Q: 21.2 | Page no. 235

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Solution Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised Concept: General Properties of the Transition Elements (D-block).
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