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Questions and Answers
Which oxidation state of cobalt tends to form many stable complexes?
Which oxidation state of cobalt tends to form many stable complexes?
- Co (I)
- Co (II)
- Co (III) (correct)
- Co (IV)
What is the KH2O exchange value for Co2+?
What is the KH2O exchange value for Co2+?
- 0.8 x 106
- 3.2 x 106 (correct)
- 5.2 x 106
- 1.8 x 106
Why is Co2+ considered a good starting material (precursor)?
Why is Co2+ considered a good starting material (precursor)?
- It has high affinity toward converting into Co3+
- It is a powerful reducing agent
- It is diamagnetic in nature
- It is labile and low in affinity toward converting into Co3+ (correct)
Why is Co3+ diamagnetic?
Why is Co3+ diamagnetic?
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Why is Co3+ unstable in an aqua medium?
Why is Co3+ unstable in an aqua medium?
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Study Notes
Cobalt Oxidation States
- Co2+ tends to form many stable complexes.
- The KH2O exchange value for Co2+ is 1.8.
Properties of Co2+
- Co2+ is a good starting material (precursor) due to its ease of preparation and ability to be oxidized to Co3+.
Properties of Co3+
- Co3+ is diamagnetic due to the pairing of all electrons in its d-orbital configuration.
- Co3+ is unstable in an aqua medium and undergoes rapid reduction to Co2+.
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