First slide

Activity Series (OR) Electro chemicals series

Question

Standard electrode potentials are
$\large F{e^{2 + }}/Fe,\,{E^0}\, = \, - 0.44V$
$\large F{e^{3 + }}/F{e^{2 + }},\,{E^0}\, = \, + 0.77V$
Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

Easy

A

Fe³⁺ increases
B

Fe³⁺ decreases
C

Fe²⁺/Fe³⁺ remains unchanged
D

Fe²⁺ decreases

Solution

SRP of Fe⁺²/Fe is negative , reduction of Fe⁺² to Fe is non spontaneous. SRP of Fe⁺³/Fe⁺² is positive, reduction of Fe⁺³ to Fe⁺² is spontaneous.
When Fe⁺³,Fe⁺²,Fe blocks are kept together Fe⁺³ undergoes reduction spontaneously to form Fe⁺². Hence Fe⁺³ concentration decreases and Fe⁺² concentration increases.

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