Why is copper used in silver coins?

Consider the systems having liquid-solid interface, (a) copper wire in silver nitrate solution and (b) silver wire in copper sulphate solution. Predict which interface will show spontaneous reaction, if E_(Cu^(2+)//Cu)^(@)=0.34V and E_(Ag^(+)//Ag)^(@)= 0.80V ?

What do you do to prevent rusting of copper and silver articles ?

Why are gold and silver often used in making ornaments?

An electric current is passed through silver nitrate soultion using silver electrodes. 10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is

(A): A blue colour is obtained when a copper wire is immersed in AgNO_3 solution (R) : Silver reduces Cu^(2+) to copper