In how many of the following reactions phosphine gas is liberated
I) White phosphorous$+\mathrm{NaOH}\stackrel{\text{ heat }}{⟶}$
II) Red phosphorous $+\mathrm{NaOH}\stackrel{\text{ Boil }}{⟶}$
III) Aluminium phosphide $+{\mathrm{H}}_2\mathrm{O}\to$
IV) Hypophosphorous acid $\stackrel{\mathrm{Boil}}{\to }$
V) Orthophosphorous acid $\stackrel{\mathrm{Boil}}{\to }$
VI) Phosphonium iodide $+\mathrm{NaOH}\stackrel{\text{ Heat }}{⟶}$
VII) Phosphorous trichloride $+{\mathrm{H}}_2\mathrm{O}\stackrel{\text{ Boil }}{⟶}$
VIII) Phosphoric acid $+\text{ Carbon }\stackrel{\text{ Heat }}{⟶}$