In which of the following half cells, electrochemical reaction is pH dependent?

Question

$Pt\,|\,F{e^{3 + }},\,F{e^{2 + }}$

$MnO_4^ - \,|M{n^{2 + }}$

$Ag\,|\,AgCl\,|C{l^{ - 1}}$

${1 \over 2}{F_2}\,|{F^ - }$

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