In how many of the following reactions phosphine gas is liberatedI) White phosphorous+NaOH⟶ heat II) Red phosphorous +NaOH⟶ Boil III) Aluminium phosphide +H2O→IV) Hypophosphorous acid →BoilV) Orthophosphorous acid →BoilVI) Phosphonium iodide +NaOH⟶ Heat VII) Phosphorous trichloride +H2O⟶ Boil VIII) Phosphoric acid + Carbon ⟶ Heat

(I) P4white+3NaOH+3H2O→PH3+3NaH2PO2 (II) Red phosphorus does not react with caustic alkalis (NaOH and KOH). (III) AlP + 3H2O → Al(OH)3 + PH3 (IV) 3 H3PO2 →∆ 2H3PO3+PH3 (V) 4H3PO3 →∆ 3H3PO4+ PH3 (VI) PH4I+NaOH→PH3+H2O+NaI (VII) PCl3+3H2O→H3PO3+3HCl. (VIII) 4H3PO4+10C → P4+ 10CO + 6H2O

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In how many of the following reactions phosphine gas is liberated
I) White phosphorous $+ NaOH \overset{heat}{⟶}$
II) Red phosphorous $+ NaOH \overset{Boil}{⟶}$
III) Aluminium phosphide $+ H_{2} O \to$
IV) Hypophosphorous acid $\overset{Boil}{\to}$
V) Orthophosphorous acid $\overset{Boil}{\to}$
VI) Phosphonium iodide $+ NaOH \overset{Heat}{⟶}$
VII) Phosphorous trichloride $+ H_{2} O \overset{Boil}{⟶}$
VIII) Phosphoric acid $+ Carbon \overset{Heat}{⟶}$

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Detailed Solution

$(I) \underset{white}{P_{4}} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{2} (II) Red phosphorus does not react with caustic alkalis (NaOH and KOH) . (III) AlP + 3 H_{2} O \to Al {(OH)}_{3} + {PH}_{3} (IV) 3 H_{3} {PO}_{2} \overset{∆}{\to} 2 H_{3} {PO}_{3} + {PH}_{3} (V) 4 H_{3} {PO}_{3} \overset{∆}{\to} 3 H_{3} {PO}_{4} + {PH}_{3} (VI) {PH}_{4} I + NaOH \to {PH}_{3} + H_{2} O + NaI (VII) {PCl}_{3} + 3 H_{2} O \to H_{3} {PO}_{3} + 3 HCl . (VIII) 4 H_{3} {PO}_{4} + 10 C \to P_{4} + 10 CO + 6 H_{2} O$