Most stable cation in aqueous medium is

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(C) The electronic configuration of $Cr^{3+}$ is $[Ar] 3d^3$.In an octahedral field,this corresponds to a $t_{2g}^3 e_g^0$ configuration.This configur

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$Cr^{3+}$

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(C) The electronic configuration of $Cr^{3+}$ is $[Ar] 3d^3$.In an octahedral field,this corresponds to a $t_{2g}^3 e_g^0$ configuration.This configuration represents a half-filled $t_{2g}$ subshell,which provides extra stability due to exchange energy.Therefore,$Cr^{3+}$ is the most stable cation among the given options in an aqueous medium.

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