Standard electrode potentials are Fe2+/Fe [Eo = $-$0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are kept together, then

Question

Standard electrode potentials are
Fe²⁺/Fe [E^o = $-$0.44] and
Fe³⁺/Fe²⁺[ E^o = 0.77];
If Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

Fe³⁺ increases

Fe³⁺ decreases

Fe²⁺/Fe³⁺ remains unchanged

Fe²⁺ decreases.

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