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2. Electrochemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry2. Electrochemistry1 Mark
MCQ
Given are $E^o$ values for some half reactions

$I_2 + 2e^-\to 2I^-$  ;     $E^o = 0.54 \,V$

$MnO_4^-+ 8H^+ + 5e^-\to  Mn^{2+} + 4H_2O$  ;  $E^o = 1.52\, V$

$Fe^{3+} + e^-\to Fe^{2+}$ ;     $E^o = 0.77\, V$

$Sn^{4+} + 2e^-\to Sn^{2+}$ ;    $E^o = 0.1\, V$
The strongest reducant and oxidant respectively are :

  • ✓
    $Sn^{2+}$,  $MnO_4^-$
  • B
    $MnO_4^-$,  $Sn^{4+}$
  • C
    $I_2$,  $Fe^{3+}$
  • D
    $I_2$,  $Sn^{2+}$
✓

Answer

Correct option: A.
$Sn^{2+}$,  $MnO_4^-$
a
Larger the value of $\mathrm{E}_{\mathrm{RP}}^{\circ}$ larger is tendency for reduction and consequently stronger will be the oxidant. Similarly, smaller the value of $\mathrm{E}_{\mathrm{RP}}^{\circ}$ larger the tendency for oxidation and consequently stronger will be the reductant.

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