White $\mathrm{P}$ reacts with caustic soda, the products are ${\mathrm{PH}}_3$ and ${\mathrm{NaH}}_2{\mathrm{PO}}_2$. The reaction is an example of

In the chemical reaction,

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+{\mathrm{aH}}_2{\mathrm{SO}}_4+{\mathrm{bSO}}_2\to {\mathrm{K}}_2{\mathrm{SO}}_4+{\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3+{\mathrm{cH}}_2\mathrm{O}.\mathrm{a},\mathrm{b}$ and $\mathrm{c}$ are

In alkaline solution ${\mathrm{KMnO}}_4$ reacts as follows

$2{\mathrm{KMnO}}_4+2\mathrm{KOH}\to 2{\mathrm{K}}_2{\mathrm{MnO}}_4+{\mathrm{H}}_2\mathrm{O}+\mathrm{O}$

Therefore, its equivalent weight will be