- AIsorotatory
- BDextrorotatory
- ✓Laevorotatory
- DOptically inactive
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$(I)$ Mond's process for purification of nickel
$(II)$ Removal of unreacted $AgBr$ from photographic plate
$(III)$ Removal of lead poisoning from the body
$I$ $-$ $II$ $-$ $III$
(image) $\mathop {\xrightarrow{{conc.{H_2}S{O_4}}}}\limits_{170^\circ C} X\mathop {\xrightarrow{{B{r_2}}}}\limits_{CC{l_4}} $ $Y\mathop {\xrightarrow{{alc.KOH}}}\limits_\Delta Z$
$Sn ^{2+}+2 e ^{-} \rightarrow Sn$
$Sn ^{4+}+4 e ^{-} \rightarrow Sn$
The electrode potentials are; $E _{ Sn ^{2+} / Sn }^{\circ}=-0.140\, V$ and $E _{ Sn ^{4+} / Sn }^{\circ}=0.010\, V$. The magnitude of standard electrode potential for $Sn ^{4+} / Sn ^{2+}$ i.e. $E _{ Sn ^{4+} / Sn ^{2+}}^{\circ}$ is $.....\times 10^{-2}\, V$. (Nearest integer)
