Standard electrode potential are <br> $Fe^{+2}/Fe\; \; \;$ $\;\; \;E^o = -0.44$ <br>$Fe^{+3}/Fe^{+2} \; \; \;$ $\; \; \; E^o = 0.77$ <br> If $Fe^{+2}, Fe^{+3}$ and $Fe$ block are kept together, than :-

Question

( A ) $Fe^{+3} decreases $
( B ) $Fe^{+3} increases $
( C ) $Fe^{+2} decreases $
( D ) $\frac{Fe^{^{+2}}}{Fe^{^{+3}}}$ remains unchanged