QJEEM04Chd717: JEE Main 2004 Chemistry - Class 12 JEEM04Chd717 Solution: Consider the following E o values = 0.77 V; = -0.14 V Under…

Question

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Consider the following E^o values

E_{F{e^{3 + }}/F{e^{2 + }}}^o

= 0.77 V;

E_{S{n^{2 + }}/S{n}}^o

= -0.14 V

Under standard conditions the potential for the reaction

Sn(s) + 2Fe³⁺(aq)

\to

2Fe²⁺(aq) + Sn²⁺(aq) is :

Accepted Answer

F{e^{3 + }} + {e^ - } \to F{e^{2 + }}\Delta {G^ \circ }

\,\,\,\,\,\,\,\,\,\, = - 1 \times F \times 0.77

S{n^{2 + }} + 2{e^ - } \to Sn\left( s \right)\Delta {G^ \circ }

= - 2 \times F\left( { - 0.14} \right)

Sn\left( s \right) + 2F{e^{3 + }}\left( {aq} \right)

\,\,\,\,\,\,\,\,\,\, \to 2F{e^{2 + }}\left( {aq} \right) + S{n^{2 + }}\left( {aq} \right)

\therefore

Standard potential for the given reaction

or

E_{cell}^o = E_{Sn/S{n^{2 + }}}^o + E_{F{e^{3 + }}/F{e^{2 + }}}^0

= 0.14 + 0.77 = 0.91\,V

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