જો $\Lambda_{{m}}^{\circ}$ $({HA})=190 \,{~S} \,{~cm}^{2} {~mol}^{-1}$, ${HA}$નો આયનીકરણ અચળાંક $\left({K}_{{a}}\right)$ $....\,\times 10^{-6}$ બરાબર છે.
$=1000 \times \frac{2 \times 10^{-5}}{0.001}=20 {~S} {~cm}^{2} {~mol}^{-1}$
$\Rightarrow \alpha=\frac{\wedge_{{m}}}{\wedge_{{m}}^{\infty}}=\frac{20}{190}=\left(\frac{2}{19}\right)$
${HA} \rightleftharpoons {H}^{+}+{A}^{-}$
$0.001(1-\alpha) \,\,0.001 \alpha \,\,0.001 \alpha$
$\Rightarrow \quad {k}_{{a}}=0.001\left(\frac{\alpha^{2}}{1-\alpha}\right)=\frac{0.001 \times\left(\frac{2}{19}\right)^{2}}{1-\left(\frac{2}{19}\right)}$
$=12.3 \times 10^{-6}$
$Z{n^{2 + }}(aq.) + 2e$ $\rightleftharpoons$ $Zn(s)$; $→$ $-0.762$
$C{r^{3 + }}(aq) + 3e$ $\rightleftharpoons$ $Cr(s)$; $→$ $ -0.740$
$2{H^ + }(aq) + 2e$ $\rightleftharpoons$ ${H_2}(g)$; $→$ $0.00$
$F{e^{3 + }}(aq) + e$ $\rightleftharpoons$ $F{e^{2 + }}(aq)$; $→$ $0.770$
નીચે પૈકી કયું પ્રબળ રીડકશનકર્તા છે?
$Cu^+_{(aq)} + e^- \rightarrow Cu_{(s)}$ માટે વિધુતધ્રુવ પોટેન્શિયલ અનુક્રમે $+ 0.15\, V$ તથા $+ 0.50\, V$ છે. $E^o_{Cu^{2+}/Cu}$ ....... $V$ થશે.
[આપેલ, $KCl$ નું મોલર દળ $74.5 \,g\, mol ^{-1}$ છે.]