Why Does Cr2+ Reduce While Mn3+ Oxidizes Despite Both Having d4 Configuration?

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Why is Cr2+ reducing while Mn3+ oxidizing when they both have d4 configuration?
 
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d4 is not the driving force behind oxidation and/or reduction.
 

Thread 'Humidity of a saturated NaCl solution with anticaking additive'

I want to test a humidity sensor with one or more saturated salt solutions. The table salt that I have on hand contains one of two anticaking agents, calcium silicate or sodium aluminosilicate. Will the presence of either of these additives (or iodine for that matter) significantly affect the equilibrium humidity? I searched and all the how-to-do-it guides did not address this question. One research paper I found reported that at 1.5% w/w calcium silicate increased the deliquescent point by...
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