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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
pn045
Phosphorus is in the +4 oxidation state in
A
H
X
3
PO
X
3
B
H
X
4
P
X
2
O
X
7
C
H
X
3
PO
X
2
D
H
X
4
P
X
2
O
X
6
(hypophosphoric acid)
Answer: D
In
H
X
4
P
X
2
O
X
6
:
4
(
+
1
)
+
2
x
+
6
(
−
2
)
=
0
gives
x
=
+
4
. The others give +3 (
H
X
3
PO
X
3
), +5 (
H
X
4
P
X
2
O
X
7
) and +1 (
H
X
3
PO
X
2
).
Practice p-Block Elements: Groups 15 and 16
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