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a
FeH2O63+
b
FeH2O62+
c
Fe(H2O)63−
d
all have equal
answer is C.
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Detailed Solution
[Fe(H2O)6]3+ Fe has an oxidation state of +3.Δo=(−2/5)3+3/5∗2=0[Fe(H2O)6]2+ Fe has an oxidation state of +2.Δo=(−2/5)4+3/5∗2= −0.4[Fe(H2O)6]3− Fe has an oxidation state of −3.Δo=(−2/5)6+3/5∗3= −0.6