The d & f Block Elements — Chemistry STD 12 Science — Question

$Fe^{3+} + e \to Fe^{2+} ;$                   $E^o = 0.771\, volts$

$I_2 + 2e\to 2I^-;$                               $E^o = 0.536\, volts$

$E^o$ cell for the cell reaction

$2Fe^{3+} + 2I^-\to 2Fe^{2+} + I_2$ is

$N{H_3} + {O_2}\xrightarrow[{Pt}]{\Delta }x + {H_2}O$

${x} + {O_2} \to y$

$y + {H_2}O{\text{(excess)}} \to {\text{x + z}}$

The incorrect option is