Given the standard electrode potentials,

Entropy is zero only at absolute zero. Enthalpy of formation is the heat change involved in the formation of one mole of the substance from its elements. An element formed...

E0cell  =  E0 cathode  −  E0 anode

Substances that are stronger oxidising agents than ferrous ions can oxidise ferrous ions. Fe2+ → Fe3+ + e-1  ;   Eø =  - 0.77 V This implies that the substances having higher reduction potentials than +0.77 V can...

your the answer A > D > B > C 

It is used for the in flow and out flow of electrons. 

SHE, whose electrode potential is taken as zero.

 At anode : Ag (s) => Ag+ + e At cathode : Ag+ + e  =>Ag (s)

The lower the reduction potential, the higher is the reducing power. The given standard electrode potentials increase in the order of K+/K < Mg2+/Mg < Cr3+/Cr < Hg2+/Hg < Ag+/Ag.  Hence,...

(a) :         A       B         C E°red +0.5V –3.0V –1.2V More is the value of reduction potential, more is the tendency to get reduced, i.e....

Increasing order of reducing power: Ag < Cu < Fe < Cr < Mg < K