Assume the cell reaction,

$$ \mathrm{A}_{(\mathrm{s})}+\mathrm{B}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{~A}_{(\mathrm{aq})}^{+2}+\mathrm{B}_{(\mathrm{s})} $$

if $\Delta \mathrm{G}^{\circ}=-386 \mathrm{~kJ}$ at 298 K . What is $\mathrm{E}_{\mathrm{Cell}}^0$ ?

Which of the following change takes place at positive electrode during working of dry cell?

Which from following statement is correct regarding emf of cell for the cell reaction,

$$ \mathrm{Cd}_{(\mathrm{s})}+\mathrm{Cu}_{(\mathrm{aq})}^{+2} \longrightarrow \mathrm{Cd}_{(\mathrm{aq})}^{+2}+\mathrm{Cu}_{(\mathrm{s})} $$

if concentration of $\mathrm{Cd}^{+2}$ is 10 times greater than concentration of $\mathrm{Cu}_{(\mathrm{aq})}^{+2}$ at 298 K .

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