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B
Fe3+
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C
Ag+
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D
Sn4+
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Solution
The correct option is DAg+ SRP of following reactions are as follows: Fe2++2e−→Fe; ----- Eo=−0.44V Fe3++e−→Fe2+;----- Eo=0.77V Ag++e−→Ag; ------- Eo=0.80V Sn4++2e−→Sn2+ ---- Eo=0.15V
Now, we know that electrode with high SRP acts as a powerful oxidising agent, i.e., can be reduced easily.
So, among the above given options, Ag+ can be reduced most easily as SRP is the highest.