Why cr+3more stable than fe+3
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»»»Fe2+ to Fe3+ oxidation potential is -0.77V hence Fe2+ is more stable than Fe3+ but if you look at configuration it is exactly opposite and you will find Fe3+ More stable
»»»But water has a reduction potential of -1.2V
»»»iron(III) salts do not spontaneously oxidize water to produce oxygen.
»»»conversely, oxygen does spontaneously oxidize iron(II) to iron(III). Solutiosn of iron(II) salts are thermodynamically unstable under aerobic (oxygen-rich) conditions.
»»»The reason behind this is that the oxidation potentials are measured with respect to hydrogen electrode so dont take them seriously
»»so fe3+ is more stable
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