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I was going through the properties of potassium permanganate and found this-

It has two physical properties of considerable interest: its intense color and its diamagnetism along with temperature-dependent weak paramagnetism.

My teacher said that the intense color is due to the charge transfer from oxygen to manganese, but didn't said the reason for temperature dependent paramagnetism. So, I thought for a while and thought about the Curie's Law.

Magnetization of a paramagnetic material is inversely proportional to the absolute temperature T

$M$ = $C$ $\frac{B_0}{T}$

Is this the correct reason for it? If not what is the reason?

Adithya
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    Curie's law applies when the species has unpaired electrons - which there are none in KMnO4, so it can't be that. Rather the weak paramagnetism is normally explained by the Van Vleck mechanism, which requires a low lying excited state - and we know there is such a state due to the purple colour of the ion. – Ian Bush Jun 16 '21 at 15:55
  • Related question for pot. dichromate: https://chemistry.stackexchange.com/questions/115841/magnetic-properties-of-potassium-dichromate – Nilay Ghosh Jun 17 '21 at 03:22

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