$01,.$

$($a$)A\frac{g}{A}gCl\frac{s}{C}{l}^{-}$

$($b$)P\frac{t}{C}{r}_2{O}_7^{2-},C{r}^{3+}$

$($c$)F{e}_2\frac{O_3}{F}eO$

$($d$)I\frac{O_3^{-}}{I_2}$

$($e$)Mn\frac{O_2}{L}{i}_{x}Mn{O}_2$

$($f$)Si\frac{O_2}{S}i$ in acidic medium