Electrochemistry

$\quad \mathrm{Zn}_{(\mathrm{s})}$ is oxidised to $\mathrm{Zn}^{+2}{ }_{(\mathrm{aq})}$

$\quad \mathrm{Zn}_{(e q)}^{+2}$ is reduced to $\mathrm{Zn}_{(s)}$

$\quad \mathrm{MnO}_{2(\mathrm{~s})}$ is reduced to $\mathrm{Mn}_2 \mathrm{O}_{3(\mathrm{~s})}$

$\quad \mathrm{Mn}_2 \mathrm{O}_{3(\mathrm{~s})}$ is oxidised to $\mathrm{MnO}_{2(\mathrm{~s})}$