MCQ
$S^{2-}$ and $SO_3\,^{2-}$ can be distinguished by using
- A$(CH_3COO)_2Pb$
- B$Na_2[Fe(CN)_5NO]$
- ✓both $(A)$ and $(B)$
- DNone of these

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Given that :
$F{e^{2 + }} + 2{e^ - } \to Fe;$ ${E^o}_{F{e^{2 + }}/Fe} = - 0.47\,V$
$F{e^{3 + }} + {e^ - } \to F{e^{2 + }};$ ${E^o}_{F{e^{3 + }}/F{e^{2 + }}} = + 0.77\,V$
