Q.3.1 Arrange the following metals in the order in which they displace each other from the solution of their salts.Al,Cu,Mg and Zn.

 Ans: The standard reduction of these metals are -1.66 V,+0.34 V,-0.44 V ,-2.37 and -0.76 respectively.

The lower the reduction potential,more the tendency to lose eletrons and thus more will be the displacement power.Thus the decreasing order of displacement power is Mg>Al>Zn>Fe>Cu.

Q.3.2 Given the standard electrode potentials.

K⁺/K=-2.93 V ,Ag⁺/Ag=0.80 V

Hg⁺/Hg=0.80 V

Mg²⁺/Mg=0.80 V Cr³⁺/Cr = -0.74 V

Arrange these metals in their increasing order of reducing power. 

Ans. The reducing power of a metal depends upon its tendency to lose electrons.Thus lower the reduction potential,more the tendency to get oxidized and thus more will be the reducing power.Hence the increasing order of their reducing power is 

Ag<Hg<Cr<Mg<K 

Q.3.3 Depict the galvanic cell in which the reaction Zn(s) +2 Ag⁺(aq)→Zn²⁺(aq)+Ag(s) takes place.Futher show:

(i) Which of the electrodes