$A$ metal used in storage batteries is

What will occur if a block of copper metal is dropped into a beaker containing a solution of $1 \ M \ ZnSO_4$?

The position of some metals in the electrochemical series in decreasing electropositive character is given as $Mg > Al > Zn > Cu > Ag$. What will happen if a copper spoon is used to stir a solution of aluminium nitrate?

In which cell,construction like a galvanic cell can be observed? Explain.

Under what condition is $E_{cell} = 0$ or $\Delta_r G = 0$?

Which of the following hot aqueous solutions is used to dip carbon rods of $H_2 - O_2$ fuel cell?