Phosphine is generally prepared in the laboratory

Question

Phosphine is generally prepared in the laboratory (A) By heating phosphorus in a current of hydrogen (B) By decomposition of P2H4 at 110°C (C) By heating red phosphorus with an aqueous solution of caustic soda (D) By heating white phosphorus with caustic potash

Tardigrade Admin · Accepted Answer

underset text White or yellow P 4+3 KOH +3 H 2 O arrow underset text Potassium hypophosphite 3 KH 2 PO 2+ PH 3

Q. Phosphine is generally prepared in the laboratory

By heating phosphorus in a current of hydrogen

By decomposition of $P_{2} H_{4}$ at 110 $^{\circ}$ C

By heating red phosphorus with an aqueous solution of caustic soda

By heating white phosphorus with caustic potash

$White or yellow P_{4} + 3 K O H + 3 H_{2} O \to Potassium hypophosphite 3 K H_{2} P O_{2} + P H_{3}$