$(i)$  $A + e \rightarrow A^{-} ; E^o= -0.24 V$

$(ii)$  $B^{-} + e \rightarrow B^{2-}; E^o  = + 1.25 V$

$(iii)$ $C^{-} + 2e \rightarrow C^{3-}; E^o  = -1.25 V $

$(iv)$ $D + 2e \rightarrow D^{2-}; E^o  = + 0.68 V$

$Zn(s) + C{u^{2 + }}(0.1\,M) \to Z{n^{2 + }}(1\,M) + Cu(s)$

$(A)$  $Sn^{+4}+ 2e^{-} \rightarrow Sn^{2+}$,      $E^o= + 0.15\,V$

$(B)$  $2Hg^{+2} + 2e^{-} \rightarrow Hg_{2}^{+2}$,        $E^o = + 0.92\,V$

$(C)$  $PbO_2 + 4H^{+} + 2e^{-} \rightarrow Pb^{+2} + 2H_2O$,   $E^o = + 1.45\,V$

$2AgCl(s) + H_2(g) \rightarrow 2Ag(s) + 2H^{+} + 2Cl^{-}$ એ $G^o$ કેટલો થશે?

$M{g^{2 + }} + 2{e^ - } \to Mg(s);\,\,E =  - 2.37\,V$

$C{u^{2 + }} + 2{e^ - } \to Cu(s);\,\,\,E =  + 0.33\,V$

$Cr_{(s)} | Cr^{3+}_{(0.1\,M)} | | Fe^{2+}_{(0.01\,M)} | Fe;$

$E^0_{{cr}^{3+} |Cr} = -0.72 \,V,$  $ E^{0}_{{Fe}^{2+}{| Fe}}$ $= -0.42 \,V$

$Zn^{+2}_{(aq)} + 2e \rightleftharpoons Zn(s), -0.76\,\, volt$ ;

$Ce^{+3}_{(aq)} + 3e \rightleftharpoons Cr(s), -0.74 \,\,volt.$

$2H^{+2}_{(aq)} + 2e \rightleftharpoons H_2(g), + 0.0\,volt$ ;

$Fe^{+3}_{(aq)} + e \rightleftharpoons Fe^{+2}_{(aq)}, + 0.77 \,\,volt$

નીચેનામાંથી કયો પ્રબળ રીડ્યુસીંગ એજન્ટ છે ?

$Pt | H_2\,(g) | H^{+}_{(aq)} (10^{-8}\, M) | | H^{+}_{(aq)} (0.001\,M) | H_2\,(g) | Pt$

$= + 0.34 \,volt, I_2/ 2I- = + 0.53\, volt$