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p-Block Elements: Groups 15 and 16
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Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus
JEE Main level
Single correct option
Difficulty 2 of 3
pn042
Phosphorus pentachloride reacts with (i) a limited amount of water and (ii) excess water to give, respectively,
A
H
X
3
PO
X
4
and
POCl
X
3
B
POCl
X
3
and
H
X
3
PO
X
4
C
POCl
X
3
and
H
X
3
PO
X
3
D
H
X
3
PO
X
3
and
H
X
3
PO
X
4
Answer: B
Partial hydrolysis:
PCl
X
5
+
H
X
2
O
POCl
X
3
+
2
HCl
. Complete hydrolysis:
PCl
X
5
+
4
H
X
2
O
H
X
3
PO
X
4
+
5
HCl
. P remains +5 throughout, so
H
X
3
PO
X
3
(P = +3) cannot form.
Practice p-Block Elements: Groups 15 and 16
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