The standard reduction potentials E0 of the following systems are Syst – InterviewSolution

1.

The standard reduction potentials E0 of the following systems are System E0volts(i)MnO−4+8H++5e−⟶Mn2++4H201.51(ii)Sn4++2e−⟶Sn2+0.15(iii)Cr2O2−7+14H++6e−⟶2Cr3++7H2O1.33(iv)Ce4++e−⟶Ce3+1.61The oxidising power of the various species decreases in the order

Answer»

The standard reduction potentials $E^{0}$ of the following systems are

	System	$E^{0}$ volts
(i)	$M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ M n^{2 +} + 4 H_{2} 0$	1.51
(ii)	$S n^{4 +} + 2 e^{-} ⟶ S n^{2 +}$	0.15
(iii)	$C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} ⟶ 2 C r^{3 +} + 7 H_{2} O$	1.33
(iv)	$C e^{4 +} + e^{-} ⟶ C e^{3 +}$	1.61

The oxidising power of the various species decreases in the order

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