$(\frac{30}{100})$ A plot of current density $($i$)$ versus overpotential $()$ was obtained as shown in

the left figure from a platinum electrode immersed in a solution of $F{e}^{2+}$ and $F{e}^{3+}$ ions at

room temperature. The right figure called Tafel plot was obtained from the left one just

by changing abscissa and ordinate and converting current from linear scale to logarithmic.

IUY I $/$ IUY H CIII

$($a$)$ Calculate charge transfer resistance $(R_{CT})$ that can be obtained in the region of

small values of overpotential. $($Hint: Don't use linear relationship in the region of

small overpotential. Small amount of information in the region would lead to serious

errors. Use Tafel equation.$)$

$($b$)$ Indicate Tafel region where the cathodic process is dominant over the anodic

process in the right figure. Explain why two different non$-$Tafel regions are

observed.$((30)/(100))$ A plot of current density $($i$)$ versus overpotential $(\backslash$eta $)$ was obtained as shown in the left figure from a platinum electrode immersed in a solution of Fe$^(2+)$ and Fe$^(3+)$ ions at room temperature. The right figure called Tafel plot was obtained from the left one just by changing abscissa and ordinate and converting current from linear scale to logarithmic. IUY I $/$ IUY H CIII $($a$)$ Calculate charge transfer resistance $($ R$\_($CT$))$ that can be obtained in the region of small values of overpotential. $($Hint: Don't use linear relationship in the region of small overpotential. Small amount of information in the region would lead to serious errors. Use Tafel equation.$)($b$)$ Indicate Tafel region where the cathodic process is dominant over the anodic process in the right figure. Explain why two different non$-$Tafel regions are observed. Please be careful for unit conversion!