In the cell represented $Pb_{(s)}|Pb_{(1 \ M)}^{2+} || Ag_{(1 \ M)}^{+}|Ag_{(s)}$,the reducing agent is

Which substance is used as cathode in a mercury cell?

Arrange the following metals in the order in which they displace each other from the solution of their salts: $Al$,$Cu$,$Fe$,$Mg$,and $Zn$.

What advantage do the fuel cells have over primary and secondary batteries?

If less than $1.1 \ V$ external opposite current is passed through the Daniell cell,for such condition answer the following questions :
$(1)$ Give reaction of cathode,anode and redox.
$(2)$ Between $Zn$ and $Cu$ which metal dissolve in solution ?

When a lead storage battery is charged: