A, B, C only

A, B, D only

A, C only

A, B, C, D

$\frac{5}{2}$

$\frac{2}{5}$

$\frac{3}{5}$

$\frac{5}{3}$

$$ \begin{aligned} & 2 \mathrm{H}_2 \mathrm{O}_2 \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \text { and } \\ & \mathrm{Cl}_2+2 \mathrm{NaOH} \longrightarrow \mathrm{NaCl}+\mathrm{NaOCl}+\mathrm{H}_2 \mathrm{O} \end{aligned} $$

$$ \begin{aligned} & \mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{PH}_3+3 \mathrm{NaH}_2 \mathrm{PO}_4 \\ & \text { and } \mathrm{Cl}_2+2 \mathrm{Na} \longrightarrow 2 \mathrm{NaCl} \end{aligned} $$

$$ \begin{aligned} & \mathrm{Cl}_2+2 \mathrm{KBr} \longrightarrow 2 \mathrm{KCl}+\mathrm{Br}_2 \text { and } \\ & 5 \mathrm{Cl}_2+\mathrm{I}_2+6 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{IO}_3^{-}+10 \mathrm{Cl}^{-}+2 \mathrm{H}^{+} \end{aligned} $$

$$ \begin{aligned} & \mathrm{Pb}_3 \mathrm{O}_4+8 \mathrm{HCl} \longrightarrow 3 \mathrm{PbCl}_2+\mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O} \text { and } \\ & \mathrm{P}_4+3 \mathrm{NaOH} \longrightarrow 3 \mathrm{H}_2 \mathrm{O}+\mathrm{PH}_3+3 \mathrm{NaH}_2 \mathrm{PO}_4 \end{aligned} $$

reduction and reduction

oxidation and reduction

reduction and oxidation

oxidation and oxidation