How is phosphine prepared using the following reagents?
(a) $H C l$
(b) $H_{2} S O_{4}$
(c) Caustic soda

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Solution

(a) $C a l c i u m p h o s p h i d e$ reacts with $h y d r o c h l o r i c a c i d$ to form $c a l c i u m c h l o r i d e$ and $p h o s p h i n e$ .
$C a_{3} P_{2} + 6 H C l \to 3 C a C l_{2} + 2 P H_{3} ↑$
(b) $A l u m i n i u m p h o s p h i d e$ reacts with $s u l p h u r i c a c i d$ to form $a l u m i n u m s u l p h a t e$ and $p h o s p h i n e$ .
$2 A l P + 3 H_{2} S O_{4} \to A l_{2} (S O_{4})_{3} + 2 P H_{3} ↑$
(c) White $p h o s p h o r o u s$ is heated with concentric $s o d i u m h y d r o x i d e$ solution, in the inert atmosphere of $C O_{2}$ to form $p h o s p h i n e$ and $s o d i u m h y p o p h o s p h i t e$
$P_{4} + 3 N a O H + 3 H_{2} O \to P H_{3} ↑ + 3 N a H_{2} P O_{2}$

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Similar questions

What is caustic soda? Where is it used?

H C l

N a C l

H_{2} S O_{4}

2 N a C l + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H C l

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