The acid used in lead storage battery is

The reaction $Zn_{(s)} + 2AgCl_{(s)} \to Zn^{2+}_{(aq)} + 2Ag_{(s)} + 2Cl^{-}_{(aq)}$ will take place in which of the following electrochemical cells?

Suggest two materials other than hydrogen that can be used as fuels in fuel cells.

Observe the following statements about a dry cell:
$I$. It is a primary battery.
$II$. Zinc vessel acts as cathode.
$III$. $A$ paste of moist $NH_4Cl$,$MnO_2$ and $ZnCl_2$ is present between two electrodes.
$IV$. The potential of this cell is $1.5 \ V$.
The correct statements are:

Which of the following statements is incorrect?

The $emf$ of the cell reaction is $1.1 \ V$. Calculate the free energy change for the reaction in $kJ$:
$Zn_{(s)} + Cu^{+2}_{(aq)} \longrightarrow Zn^{+2}_{(aq)} + Cu_{(s)}$