Electrochemistry Ques 18
18. Standard electrode potentials are : $Fe^{+2} / Fe$ $[E^{0}=-0.44] ; Fe^{+3} / Fe^{+2}[E^{o}=+0.77] ;$ If Fe${ }^{+2}$, $Fe^{+3}$ and $Fe$ blocks are kept together, then
[2001]
(a) $Fe^{+2}$ increases
(b) $Fe^{+3}$ decreases
(c) $\frac{Fe^{+2}}{Fe^{+3}}$ remains unchanged
(d) $Fe^{+2}$ decreases
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Answer:
Correct Answer: 18.(b)
Solution:
(b) The reduction potential is higher in case of $E^{\circ}(Fe^{3+} / Fe^{2+})=+0.77 V$. Thus, $Fe^{3+}$ will readily reduce to $Fe^{2+}$ and quantity of $Fe^{3+}$ will decrease.
BETA
