If $6$ batteries are connected in series in a car,and each battery has a potential of $2 \ V$,what is the total voltage of the battery system (in $V$)?

Fill in the blanks :
$1.$ $E_{cell}^o$ of Daniell cell $= $ ........... .
$2.$ In Daniell cell,$n = $ ........... .
$3.$ For $Al + 3Ag^{+} \rightarrow Al^{3+} + 3Ag,$ $n = $ ...........

What is the function of a salt bridge in a Daniell cell?

Give the types and examples of electrodes.

Which of the following species acts as a reducing agent during the working of a hydrogen-oxygen fuel cell?

Define inert electrode and give an example. Also,define an active electrode and give examples.