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Question

The standard redox potentials Eo of the following systems are:

SystemEo (volts)
(i)MnO4+8H++5eMn2++4H2O1.51
(ii)Sn2+Sn4++2e0.15
(iii)Cr2O27+14H++6e2Cr3++7H2O1.33
(iv)Ce3+Ce4++e1.61
The oxidising power of the various species are related as:

A
Cr2O27>MnO4
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B
Ce4+>Sn4+
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C
Ec4+>MnO4
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D
MnO4>Sn4+
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Solution

The correct options are
B Ce4+>Sn4+
C Ec4+>MnO4
D MnO4>Sn4+
Species with higher reduction potential have higher oxidising power.
S.R.PO.A S.R.P=S.O.P
Eoce+4|Ce+3>EoMnO4|Mn+2>EoCr2O27|Cr+3>EoSn+4|Sn+2
1.61 1.51 1.33 0.15

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