Arrange Al, Cd, Pb & Zn in order of increasing chemical activity. Given : `E_(Al^(3+)|Al)^(@)=-1.66V`,
`E_(Cd^(2+)|Cd)^(@)=-0.402V," "E_(Pb^(2+)|Pb)^(@)=-0.126V,`
`E_(Zn^(2+)|Zn)^(@)=-0.76V.`

Given that E_("Al^(3+)|Al)^(@)=-1.66V, E_(Cd^(2+)|Cd)^(@)=-0.40V, E_(Pb^(2+)|Pb)^(@)=-0.126V and E_(Zn^(2+)|Zn)^(@)=-0.76V , arrange Al, Cd, Pb and Zn in increasing order of their reactivity.

Arrange Ag^(+), Zn^(2+), H^(+) and Na^(+) in order of their tendency to be liberated at cathode. ["Given : "E_(Ag^(+)|Ag)^(@)=+0.80V, E_(Zn^(2+)|Zn)^(@)=-0.76V, E_(2H^(+)|H_(2))^(@)=0.00V, E_(Na^(+)|Na)^(@)=-2.17V]

Under standard conditions, which one of the reactions is not feasible (E_(Ni^(2+)|Ni)^(@)=-0.25V, E_(Cd^(2+)|Cd)^(@)=-0.4V, E_(Fe^(2+)|Fe)^(@)=-0.44V, E_(cu^(@+)|Cu)^(@)=+0.34V) -

Arrange K^(+), Zn^(2+), H^(+), Cu^(2+) ions in order of their tendency to be liberated at cathode. [E_(cu^(2+)|Cu)^(@)=+0.34V, E_(2H^(+)|H_(2))^(@)=0.00V , E_(Zn^(2+)|Zn)^(@)=-0.76V E_(K^(+)|K)^(@)=-2.93V]

Represent symbolically the galvanic cells in which the following reaction occurs. Calculate the standard electromotive forces of the cells : (3) Zn+H_(2)SO_(4)rarr ZnSO_(4)+H_(2) Given : E_(Fe^(2+)|Fe)^(@)=-0.44V, E_(Sn^(2+)|Zn)^(@)=-0.14V , E_(Cu^(2+)|Cu)^(@)=0.34V, E_(Zn^(2+)|Zn)^(@)=-0.76V , E_(H^(+)|(1)/(2)H_(2))^(@)=0.00V .

Determine the EMF of a decimolar Daniell cell at 25^(@)C . Given : E_(Zn^(2+)|Zn)^(@)=-0.76V and E_(Cu^(2+)|Cu)^(@)=+0.34V .

Represent symbolically the galvanic cells in which the following reaction occurs. Calculate the standard electromotive forces of the cells : (2) Fe+Sn^(2+)rarr Fe^(2+)+Sn Given : E_(Fe^(2+)|Fe)^(@)=-0.44V, E_(Sn^(2+)|Zn)^(@)=-0.14V , E_(Cu^(2+)|Cu)^(@)=0.34V, E_(Zn^(2+)|Zn)^(@)=-0.76V , E_(H^(+)|(1)/(2)H_(2))^(@)=0.00V .

Represent symbolically the galvanic cells in which the following reaction occurs. Calculate the standard electromotive forces of the cells : (1) Fe+CuSO_(4)rarr FeSO_(4)+Cu Given : E_(Fe^(2+)|Fe)^(@)=-0.44V, E_(Sn^(2+)|Zn)^(@)=-0.14V , E_(Cu^(2+)|Cu)^(@)=0.34V, E_(Zn^(2+)|Zn)^(@)=-0.76V , E_(H^(+)|(1)/(2)H_(2))^(@)=0.00V .

Given that, E_(Zn^(2+)|Zn)^(@)=-0.76V, E_(Cu^(2+)|Cu)^(@)=+0.34V , E_(Ni^(2+)|Ni)^(@)=-0.25V and E_(Ag^(+)|Ag)^(@)=+0.80V Which metal ions are reduced by Ni ?