Q. What is the standard reduction potential $(E^{\circ})$ for $Fe X^{3 +} \to Fe$ ?
Given that :
$F e^{2 +} + 2 e^{-} \to F e; E_{F e^{2 +} / F e}^{\circ} = - 0.47 V$
$F e^{3 +} + e^{-} \to F e^{2 +}; E_{F e^{3 +} / F e^{2 +}}^{\circ} = + 0.77 V$

5556 208 JEE MainJEE Main 2017Electrochemistry Report Error

A

$- 0.057 V$

38%

B

$+ 0.057 V$

30%

C

$+ 0.30 V$

26%

D

$- 0.30 V$

6%

Solution:

Correct answer is (a) $- 0.057 V$