Construct galvanic cells from the following pairs of half cells and calculate their emf at `25^@C`
`Sn,SnCl_2(1M) E_(Sn^(2+),Sn)^@=-0.14` volt
and `Fe|FeSO_4 (1M) E_(Fe^(2+),Fe)^@=0.44` volt

Predict whether the following reaction will occur spontaneously or not: Co^(2+) + Sn rarr Co + Sn^(2+) E_(Co//Co^(2))^(@) = 0.277 volt and E_(Sn//Sn^(2+))^(@) = 0.136 volt

An iron rod is immersed in a solution containing 1.0 M NiSO_(4) and 1.0 M ZnSO_(4) Predict giving reasons which of the following reactions is likely to proceed ? (i) Fe reduces Zn^(2+) ions, (ii) Iron reduces Ni^(2+) ions. Given : E_(Zn^(2+)| Zn )^(0) = -0.76 volt and , E_(Fe^(2+)|Fe)^(0) = -0.44 volt and E_(Ni^(2+)|Ni)^(0) = -0.25 V