Cr3+ is most stable ion in aqueous solution. Why?

Cr3+ has electronic config. as [Ar] 3d3 i.e.has 3 unpaired electron. 

According to CFT it has configuration as t2g3 and hence is extremely stable in aqueous solution.

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After losing 3 electrons, Cr configuration becomes 4s^0 3d^3. This is a very stable configuration, specially in water. Study Crystall Field Splitting Theory for a better understanding.

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