The electrical potential difference set up between the metal electrode and its solution is known as electrode potential. The single electrode potential is originated by the separation of charges between the metal electrode and its solution.

SinceECu2+/CuECu2+/Cuhas a greater positive value thanEH+/HEH+/H, the reaction that is feasible at the cathode is

Cu2+(aq)+2eCu(s)

The standard reduction potential of copper is lower than silver.
E Cu2+/Cu = 0.34V
E Ag+/Ag = 0.80V
The copper is oxidized when dipped into AgNO3solution and becomes bluish.

2 AgNO3+ Cu –> Cu(NO3)2+ 2 Ag

The following reaction should take place: Z n + H ₂ S O ₄ Z n S O ₄ + H ₂

_{Std. EMF of the cell ( E c e l l ) = [ Std. redn. pot. of R.H.S. electrode ] [ Std. redn. pot. of L.H.S. electrode ] = 0 ( 0.76 ) = + 0.76}

Thus, the EMF of the cell comes out to be positive. hence, the reaction takes place.

Electrode Potential of EX = 0.4

Electrode Potential of EY = -0.8

Since EX > EY ,Metal X will displace metal Y from it’s salt solution.