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

The cells which can be recharged are:

Fill in the blanks :
$(1)$ In a galvanic cell,the anode and cathode possess $\dots$ and $\dots$ charge respectively.
$(2)$ According to convention,the anode and cathode in a galvanic cell are present on the $\dots$ and $\dots$ side respectively.

$Zn_{(s)} | Zn^{2+}_{(aq)} || Cu^{2+}_{(aq)} | Cu_{(s)}$ is

Which of the following statements is true about the voltaic cell?

Standard free energies of formation (in $kJ/mol$) at $298 \ K$ are $-237.2$,$-394.4$,and $-8.2$ for $H_2O_{(l)}$,$CO_{2_{(g)}}$,and pentane$_{(g)}$ respectively. The value of $E^o_{cell}$ for the pentane-oxygen fuel cell is .......... $V$.