MCQ
The rate law for reaction $A + 2B = C + 2D$ will be
- ARate $ = K[A]\,[B]$
- BRate $ = K[A]\,[2B]$
- ✓Rate $ = K[A]\,{[B]^2}$
- DRate $ = K\frac{{[C]{{[D]}^2}}}{{[A]{{[B]}^2}}}$
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$Mn_{(S)} | Mn^{+2}_{(aq)} (0.4\,M) | | Sn^{+2}_{(aq)} (0.04\,M)| Sn_{(S)}$,
Calculate free energy change $\left( {\Delta G} \right)$ at $298\, K.$ .......... $\mathrm{kJ}$
Given : $E_{M{n^{ + 2}}/Mn}^o = - 1.18\,V ; \,E_{S{n^{ + 2}}/Sn}^o = - 0.14\,{\rm{volt}}\,\frac{{2.303RT}}{F}=0.06$
$MnO _{4}^{-}+8 H ^{+}+5 e ^{-} \rightarrow Mn ^{2+}+4 H _{2} O$,
$E^{o} _{ Mn ^{2+} / MnO _{4}^{-}}=-1.510 \,V$
$\frac{1}{2} O _{2}+2 H ^{+}+2 e ^{-} \rightarrow H _{2} O$,
$E _{ O _{2} / H _{2} O }^{o}=+1.223 \,V$
Will the permanganate ion, $MnO _{4}^{-}$liberate $O _{2}$ from water in the presence of an acid ?