What is salt bridge? Why is it used in electrochemical cell?

What is salt bridge? Mention it functions.

What is a meter bridge? What principle is used in it?

Why salt bridge is not required in a lead storage cell?

Why a meter bridge is used?

Explain how rusting of iron is envisaged as setting up of an electrochemical cell.

What is a cell plate?

Following are the data of standard reduction half cell potentials of certain electrochemical cells. E_(Ag^(+)//Ag)^@ = 0.80V & E_(Cu^(2+)//Cu)^@ = 0.34V E_(Sn^(2+)//Sn)^@ =-0.14V & E_(Na^(2+)//Na)^@ = -2.71V Represent the electrochemical cell constructed from these pair of half cells.

Explain - Cs metal is used in photo electric cell.