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Laboratory method for the preparation of phosphine is :

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${Ca}_{3} P_{2} + 6 HCl \overset{}{\to} 3 {CaCl}_{2} + 2 {PH}_{3}$

${Ca}_{3} P_{2} + 6 H_{2} O \overset{}{\to} 3 Ca {(OH)}_{2} + 2 {PH}_{3}$

$P_{4} + 3 NaOH + 3 H_{2} O \overset{}{\to} {PH}_{3} + 3 {NaH}_{2} {PO}_{2}$

${PH}_{4} I + KOH \overset{}{\to} KI + H_{2} O + {PH}_{3}$

answer is C.

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Detailed Solution

By boiling white phosphorous with 30 to40 %solution of caustic soda in an inert atmosphere of CO₂ to give impure phosphene.

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