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JEE Advanced Model Paper 18 with solutions for online practice
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© examsnet.com
Question : 21
Total: 60
Phosphine gas is not prepared by
C
a
3
P
2
+ dil . HCl
P
H
4
I
+ KOH soln
Red phosphorus + NaOH soln
Δ
→
P
4
+ NaOH soln
Δ
→
Validate
Solution:
C
a
3
O
2
+ 6HCl →
3
C
a
C
l
2
+
2
P
H
3
↑
P
H
4
I
+ KOH →
P
H
3
↑ + KI +
H
2
O
P
4
+ 3NaOH +
3
H
2
O
→
P
H
3
↑ + 3
N
a
H
2
P
O
2
Red phosphorus + NaOH soln
Δ
→
no reaction
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